Malicious PDF — malware analysis report

Static analysis result for SHA-256 41159547f92c6c4a…

MALICIOUS

PDF

72.8 KB Created: 2020-11-17 06:11:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 965452e1e378c50558865c845bbc1b1e SHA-1: dd78f6d942ac6bd93ecea8152c119bb216553e6a SHA-256: 41159547f92c6c4aff32ef91be44016ce4501f041254fff6839de517e0a16c92
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 5

  • 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.
  • 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/123?utm_term=tail+light+bulb+finder PDF link annotation
    • https://giboramogu.weebly.com/uploads/1/3/4/6/134627050/330bc74a5a946dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5fabe9eb1f924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_5fa0313a94d8b.pdfIn PDF document text
    • https://gomamatugapisum.weebly.com/uploads/1/3/4/3/134392688/9690facca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376598/normal_5fa462020fb13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453117/normal_5fafed8457da6.pdfIn PDF document text
    • https://fufajogaxofamu.weebly.com/uploads/1/3/4/6/134627879/6605444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_5f9ceafa28dff.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/tedawonuf.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/mukobuf.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/b274c1f7-312f-4343-81d8-da2253ba0919/jajuxelika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac105af2-30d4-4cf0-84ad-e38868e38f32/gopitisurobovoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abba005-79ae-4732-bda1-73f120609323/livre_soupe_thermomix_tm5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4496b9d2-0699-47fe-97f5-6ba81f40bf51/nugekesorobirofek.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_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 5080 bytes
SHA-256: 7df58696e041a7800335a96bb516a0bf69fcec3e77e8a036df7585536d894595
font_01_sfnt_off0000f1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FB 10656 bytes
SHA-256: 1a52068c967649501a637595d3c2e0aac556a085bbbe8e2405d27ad87a2bf42e

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