Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9fc21a1dd4be74…

MALICIOUS

PDF

66.0 KB Created: 2020-11-18 18:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 029cd4f9d2bbb4ce41d53769fabe68b8 SHA-1: 1e4534084a10ba26233040008eaba4ca9ef299b6 SHA-256: af9fc21a1dd4be741892e68a4277c486fa3255bb2a8b62683f605d0cd391bb15
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafftec.ru/123?utm_term=launch+x431+v%252B+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5f98a7104b4cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5fa10f63a7aa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5fab334865f72.pdfIn PDF document text
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/fofage-pumuzu-napejugaboxonuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388420/normal_5f938a93edea4.pdfIn PDF document text
    • https://favasebuwakule.weebly.com/uploads/1/3/4/3/134328846/3fa41ed1292d66.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/28f0a18c00fab3f.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/1168020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_5f9a6b693a3cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5fa26be75c851.pdfIn PDF document text
    • https://xokafewapi.weebly.com/uploads/1/3/4/4/134488510/xofotazere.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_5f8ba4bfb051f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sikuva/academic_performance_test.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/watch_malayalam_movies_2019_online.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_off0000c656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC656 5140 bytes
SHA-256: 73b62623de77d1b2631f951a246ee6e4fe7ab380b70218e66eef1bff60181f6b
font_01_sfnt_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 10404 bytes
SHA-256: 0a39f6ff220af9dfa75f71ec5215f95d6fe8edc13cb25b59d9f6e25d3511b497

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