Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19a623d2b14b2f3…

MALICIOUS

PDF

69.5 KB Created: 2021-02-16 23:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: abba19dc2dc799ec5798b6cbe2f022ad SHA-1: 7fd12f79fc4dc671fb3b8fd1559f0e5d201c4776 SHA-256: f19a623d2b14b2f3f869a0148dd46fc62fad28361e21de276ea32b499c869425
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous external links, with one heuristic specifically identifying a 'mass external PDF link farm'. The document body, though partially corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis. No scripts were extracted, but the presence of many external URLs indicates a likely attempt to redirect the user to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=what+are+the+best+quiz+topics PDF link annotation
    • https://vifazadaza.weebly.com/uploads/1/3/4/8/134883600/1588657.pdfIn PDF document text
    • https://cdn.sqhk.co/wogirujut/hc4ibqo/come_play_cast.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502336/normal_5fdf5e1f8adc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fcbdb837eafe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464852/normal_6004c527948d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5fd9b3658a414.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/ifYiblE/79714540535.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/ahiZpjc/red_ball_4_cool_math.pdfIn PDF document text
    • http://prazdnikprosto.ru/sogudczfvx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421959/normal_600195a17c2c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421056/normal_5feefac48e822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481270/normal_601a9dd59c962.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC478 5092 bytes
SHA-256: 5498c6b3d8d70cdd0ade2976e67f1f63c30444a777170d0aa092c86aac8eecb9
font_01_sfnt_off0000d5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 11068 bytes
SHA-256: 1c51ce10d5aa34d1f2b0efe9349df45f2d42ae6b3e2df6e10a660df0f7a1cc16
font_02_sfnt_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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