Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d50a51a4f2491b2…

MALICIOUS

PDF

60.5 KB Created: 2021-01-03 04:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 77acce1cc01a334965b2049c25d94768 SHA-1: 92f407041d4adc3b6f35a376fd2a843e55951208 SHA-256: 6d50a51a4f2491b2d5e4e60627c3f62e9265dda6452e919a9622cdad84598e10
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/aws?utm_term=how+to+glue+sheet+metal+together PDF link annotation
    • https://sedemosifov.weebly.com/uploads/1/3/0/8/130874126/wepikelafizupajivalo.pdfIn PDF document text
    • https://polisurev.weebly.com/uploads/1/3/0/7/130740145/laxezunoxo_wiwebovasorap.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/6472053.pdfIn PDF document text
    • https://jileninaniwepuz.weebly.com/uploads/1/3/4/7/134771173/ziwij.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/pilenapidokabi_mazosod_ferixejimada.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/kavafabazotod.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/lanaxutodi.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/29e86947-5e0c-4545-be7a-99dc7c03a1b8/zetalokosilipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ddf9cdd-504c-43bc-a2b1-aefdb7d1e178/best_wolfenstein_game_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a10769bb-0b9b-4c2c-8a61-dd5684d26601/deborah_r._nelson-mathers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bcd967-a471-46fb-bb8d-27955d497519/98693420787.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_off0000b442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB442 5152 bytes
SHA-256: 1f8f1b605e3353ba4c944c23aa99961578a3044cebdd0a9bab44540d0dd6fe85
font_01_sfnt_off0000c5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B1 9208 bytes
SHA-256: 3bdd5444978be42d12fa3cbb73c3139ec2210d28643d1dd58e50d60b0e5afbd6

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