Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3684c476a59e27…

MALICIOUS

PDF

80.2 KB Created: 2021-06-12 06:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 09e8a6a53c4fcfddf69d7a52e00243bb SHA-1: 5fbddac48e02c159702b4bab508680739c04d757 SHA-256: 4c3684c476a59e27745ba7c4207739024f03e04ee714bf8cfed56714b1f3a1dd
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of 'SE_DOWNLOAD_BUTTON' heuristic indicates a lure for users to click, likely leading to further compromise. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://catamma.ru/pbw?utm_term=the+sims+freeplay+android+cheats+unlimited+money PDF link annotation
    • https://vixozomaregug.weebly.com/uploads/1/3/1/3/131398278/f7e371d67.pdfIn PDF document text
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/jovositegetez.pdfIn PDF document text
    • https://fiduwovizeget.weebly.com/uploads/1/3/4/5/134517619/rinedi-mezalelo.pdfIn PDF document text
    • https://direnebem.weebly.com/uploads/1/3/4/6/134641367/d42700.pdfIn PDF document text
    • https://gozenanojive.weebly.com/uploads/1/3/4/7/134747079/gibedifubisutuwunufo.pdfIn PDF document text
    • https://vufofameti.weebly.com/uploads/1/3/0/8/130874118/xelimulaf.pdfIn PDF document text
    • https://jipenudus.weebly.com/uploads/1/3/1/4/131406532/nufokodagevif-sazedel.pdfIn PDF document text
    • https://bemetapijulew.weebly.com/uploads/1/3/1/4/131437656/sepow-gozujarulorapa-gitiposisagezo.pdfIn PDF document text
    • https://mosufewo.weebly.com/uploads/1/3/4/6/134685447/rexufeboworogez-raxogo-xufufot.pdfIn PDF document text
    • https://xiliperudal.weebly.com/uploads/1/3/3/9/133999468/9973ae4175b79.pdfIn PDF document text
    • https://zirefugat.weebly.com/uploads/1/3/0/7/130740019/fb5212c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3eb22099-b6e8-42f5-a6a1-0db4788130a6/fumatumagafonakupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2898847f-0046-461c-b020-0c9a232967d1/hp_probook_6560b_laptop_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9db3bb-bce0-4e22-be90-4fb3310540cb/99861070651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0ab966-b6c3-4912-8af9-f538d9b2a0ee/where_can_i_buy_dunkin_donuts_mocha_swirl_syrup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71fcffd6-97a3-4cfd-a052-2088995f0cd2/what_can_cause_one_bloodshot_eye.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f2a287-e499-4a51-a82c-5b4511958332/wotazavoberonojob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0c008b-62fd-4040-a6fe-2fc493a4075e/xafuroduwufunukitototafir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb16b305-6289-4450-a327-bff5e800ba6f/srs_document_for_hospital_management_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/105f84f5-5ebd-4d13-9d8c-e9d976ee4571/90770094766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d795ef83-3abc-4456-b08c-681088dc438d/lejepafexubisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8e4026-2050-4adc-aeb3-ab88764cd77e/is_google_maps_free_to_embed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9146df23-ab49-456c-b873-72ec6b296712/best_build_for_ranger_neverwinter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d8ec86-0b18-46c1-8f75-56da87375478/64890611731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f9fe404-4806-49e7-9080-cadad1c75d2b/77680279925.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 5328 bytes
SHA-256: bb7d55e9d530892573b09535d0268baeffa7581528b6d37c3f3ff919d36b3b40
font_01_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 10360 bytes
SHA-256: c46bd14f8b4f2677a53102052a9665b603f37c2cc9cffba949bcff40a39b2bf1
font_02_sfnt_off00012489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12489 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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