Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb13dd0994e961c…

MALICIOUS

PDF

87.9 KB Created: 2021-03-28 01:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: acc68d52fb78edf81267093b30e1f577 SHA-1: c8d0624a7f920aaf2e1b482c53501e66615223f4 SHA-256: 4fb13dd0994e961c04cbfaa89e300376fe61f3129847943ad35e3272860adca8
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=the+bugs+bunny+road+runner+movie+netflix In PDF document text
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/9313292.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/tidezoziwokojidetipejize.pdfIn PDF document text
    • http://bepifukikuku.mygamesonline.org/dish_network_sat_129_channels.pdfIn PDF document text
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/jerimozevoz.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/2261156.pdfIn PDF document text
    • https://zefisuket.weebly.com/uploads/1/3/4/8/134868467/5d971.pdfIn PDF document text
    • https://nisudine.weebly.com/uploads/1/3/1/4/131454656/kufarut_mewefufezizi_resalutor.pdfIn PDF document text
    • https://miregunuvarur.weebly.com/uploads/1/3/3/9/133997549/fusok.pdfIn PDF document text
    • https://nobarikanu.weebly.com/uploads/1/3/1/4/131483152/8f48796a00bd2ab.pdfIn PDF document text
    • http://fatunatet.getenjoyment.net/95293800882.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/8db44461-96af-434f-9291-a4cb10ac8785/15611795109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa36552c-dcfb-4cb7-8d14-0456f1a09d59/dd_young_white_dragon_stats.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/71285004844.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/60517903426.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_a39f019e6a274149851197538a998717.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db32440a-7808-4e9e-b4d5-1b150c34bdb4/19305744825.pdfIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_e195025fc8a8439aa5f2ecf005bf4fc2.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_93a648c10a0d46a58acfb0a99c74ae26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f8cd3f-f6dd-427c-8667-b2fe2b7eaca2/rumidejomafud.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_395472ef76d64dbeb67a5411e87b8818.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15203b26-4046-4eda-81c0-8b0dfa5324fc/canon_eos_650d_digital_slr_camera_review.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/principles_of_microeconomics_8th_edition_mankiw_test_bank.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/android_wear_2._0_sleep_tracker.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_3cc83a06094242c4996f862b69abfccf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/78779806500.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_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 5524 bytes
SHA-256: 048057ea81010df74c4608531fcd05c10d0b43cffedcc80e6571dd9eada1472d
font_01_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 10716 bytes
SHA-256: d06f590ae5301d6b07f23070b1ce653aa883db728258c5c83a97680576d3bda3
font_02_sfnt_off000143e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f