Malicious PDF — malware analysis report

Static analysis result for SHA-256 8858f19c3cf60258…

MALICIOUS

PDF

128.8 KB Created: 2020-12-17 11:08:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c88ab0ad55972aa83d7c7a8808d783d3 SHA-1: 72af583aa881edfbe937f19e347df62afba4f716 SHA-256: 8858f19c3cf60258ee43c30e629a57198e3a8536513404dee75a40029664b462
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One prominent URL, 'https://traffset.ru/123?utm_term=pce.emu+apk+1.5.38', is directly embedded and suggests a lure related to an Android application. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://traffset.ru/123?utm_term=pce.emu+apk+1.5.38 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f89426f30909.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/8515383.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ebe446-a0e0-438d-9582-39b2129107de/38872926896.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe137a173fb5383b69d442/1606292349641/kakogebobozenuburutun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38abdb24-9680-4bd2-bf52-0c72e2f16842/47919123784.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd16075e198d0a3863b27a/1606227464221/jelitimejirabijef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e59f259f-0cb7-43bf-9642-4bf8dcdec16b/17519558652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc043a17-bc9f-42bd-beae-74b7dca8725d/350z_owners_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf4f1ae52d9c57dc0f0f00/t/5fd0244a125f6a657a42a916/1607476299381/vilukivesotidujawosejideb.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2c204c30a162e0c5e803a/t/5fcc54ddfe657040d58722a1/1607226589712/49222931017.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001aeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEAC 5404 bytes
SHA-256: 2fbdd94a1986711e38a2033dd7825615cfd4f33c1d7e12435a8c5532685d6913
font_01_sfnt_off0001c10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C10C 11356 bytes
SHA-256: 34de9973a53da9e1a24f5ffb8858d1d53e61436d173dbf5df1f2f72ad1df35a3
font_02_sfnt_off0001e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E784 3888 bytes
SHA-256: b0d8031072f4dae759bdbb523391a0fb98d2272a06e5b888c3fd0440c54c633c

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