Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa82c0399c50cfd…

MALICIOUS

PDF

66.4 KB Created: 2020-11-26 01:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 74ecf249a2334472f9de9c9b7c18a4c8 SHA-1: 1f0fd2bfd7bfe834cc0afd142725beee6172198b SHA-256: 7fa82c0399c50cfd49678a50244deaae217c0bd0bf53c273456f348695aaa39b
186 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 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://trafficel.ru/strik?utm_term=5e+draconic+sorcerer+build PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390055/normal_5f91f76c7c88b.pdfIn PDF document text
    • https://zaruvuverabepu.weebly.com/uploads/1/3/4/0/134017911/1337760.pdfIn PDF document text
    • https://siragakepog.weebly.com/uploads/1/3/4/8/134890789/6068236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5fa14488a46c2.pdfIn PDF document text
    • https://mujubafajereked.weebly.com/uploads/1/3/4/5/134595908/toguduwekepo-kuzotavoxo-vegonukeroroku.pdfIn PDF document text
    • https://gojanevalu.weebly.com/uploads/1/3/4/3/134353606/titifere.pdfIn PDF document text
    • https://poraduke.weebly.com/uploads/1/3/4/3/134385775/feriboka_zuzixomodepoko_nifowifoxovulut.pdfIn PDF document text
    • https://bexitapanirid.weebly.com/uploads/1/3/0/9/130969950/dipesusuno_jisifavijowaze.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/a6dbb631-d8df-4193-bd30-29151021ccba/gixejuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8192f3-02dd-4c96-bcf2-cf7364085452/wewofenatime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6360184d-39a6-4709-bbc7-bae62dc20562/56038710362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a43712b-1079-4507-ae14-df4bbce77397/mafubikevot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9074dd-2c1d-42e5-9260-b5d0410f1d0e/rixikemenexutexunefi.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_off0000c79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79F 5100 bytes
SHA-256: 7ebe8d494e8323a9267b884524056804128164a38e0e327c85a68c93707ccb62
font_01_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 10600 bytes
SHA-256: 9055869f282ea4f56724ac00b01576ca914d085dba705243020a9be506ed8be5

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