Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55d4c7f0af97bd5…

MALICIOUS

PDF

73.7 KB Created: 2021-06-10 23:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4ad902968501c00c667b9154b47e44ae SHA-1: b643c992e2733319ae608502c3115ed9aeec47fb SHA-256: e55d4c7f0af97bd5530e126ecf6d13af599c1a4b69ecc8a6a8bedc006a387db4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the PDF as malicious, specifically a phishing or trojan variant. While no scripts were directly extracted, the structure and heuristic firings suggest the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://inwebjor.ru/pbw?utm_term=present+perfect+tense+present+perfect+continuous PDF link annotation
    • https://gimipozadifan.weebly.com/uploads/1/3/1/3/131380487/7538591.pdfIn PDF document text
    • https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/b3c21a496.pdfIn PDF document text
    • https://ruxibudowivuk.weebly.com/uploads/1/3/4/7/134728491/kixuz_dawosudosuwikon_wawiwo.pdfIn PDF document text
    • https://zumofadun.weebly.com/uploads/1/3/4/0/134042547/debirenemori_vejojoz_gikugisuliwi.pdfIn PDF document text
    • https://xezixopizanew.weebly.com/uploads/1/3/5/3/135314636/milofaruvi-fimudinivuk-wetebusodadew.pdfIn PDF document text
    • https://vevorusafe.weebly.com/uploads/1/3/4/5/134516648/a4f83b837e.pdfIn PDF document text
    • https://rabibenexu.weebly.com/uploads/1/3/5/3/135319922/lemuletekos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f95826-da22-4fa9-be66-839d58127c12/what_is_the_concentrix_stock_symbol_on_nasdaq.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10f9755-7b36-4ec9-b6c0-b08818b4b429/66782177429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0130ea19-5312-4612-94af-6879a7931a2d/6695943433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98db48e6-bf24-4a7c-abaa-4dff78af63b2/95066200133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa1c9b7-59be-451a-bcec-48dd7e822ab0/how_to_get_the_bolt_action_rifle_rdr2_early.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb65fe0-523c-492d-a3ce-7c192c5fcda1/51589300395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1ca740-dd49-4083-a898-4ec675a5cc63/23324609816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b4badb-fdeb-4b02-9156-eb8bdbbfa283/replacement_cartridge_for_audio_technica_lp120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec71474-2e03-4caf-b719-800f26bc4d6d/geronimo_stilton_season_1_episode_2_dailymotion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0adfc94a-65aa-4987-b2f4-6da241f6faca/nec_dt300_call_forwarding_to_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86d0b7b-d21a-4029-bc44-c057ab65616e/xizowusirepizarofifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630b8f2b-5d9a-4821-95f0-bee2c7326992/theoretical_vs_experimental_probability_activity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9479177c-9872-41ff-b3e1-dca372c7bb51/74918970378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/133f29c7-0448-47f7-9da6-1861ad27e005/remington_1100_synthetic_stock_recoil_pad.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 4768 bytes
SHA-256: 9f47c79d38c78ee83558843669a05cc1b1bf0f7b87ad485c15a0eebbbe861277
font_01_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 10416 bytes
SHA-256: 833006d420b62296e60dc72bc625cc76e1cda2753da1ec25f003e15b24a33bec

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