Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cb5637bf0b3589…

MALICIOUS

PDF

75.5 KB Created: 2021-03-25 08:11:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 806db88ffaa9ca506e6a4ae00c2c7b92 SHA-1: e23a32b2874a62a133976f0527ded0e46bceb196 SHA-256: f1cb5637bf0b35895ffebf834a60b3cce141c6d4bc4422ae4baab44ff255c352
186 Risk Score

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://jottigo.ru/wix?keyword=area+mixed+shapes+worksheet+answers+l2s2 PDF link annotation
    • https://zonapabudaxaj.weebly.com/uploads/1/3/4/0/134017389/6153276.pdfIn PDF document text
    • http://zoompol.xyz/jenogufuzitegifuzinuvgrnv1.pdfIn PDF document text
    • https://xuxoxipabixu.weebly.com/uploads/1/3/4/5/134588436/fagapix.pdfIn PDF document text
    • https://xopisamu.weebly.com/uploads/1/3/0/7/130776659/muzofasen.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/3BY4iiD/ludo_boy_or_girl_name.pdfIn PDF document text
    • https://nalafefig.weebly.com/uploads/1/3/1/3/131379301/e09cfd875.pdfIn PDF document text
    • https://cdn.sqhk.co/fopalixogul/PACAhiQ/mabisogimuwixa.pdfIn PDF document text
    • http://formulamoney.top/sodevekq1430.pdfIn PDF document text
    • https://vibikawezawu.weebly.com/uploads/1/3/4/7/134734059/wopoxu-tudasawo-bidapax-pojixex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_f0a56210a55741acaf3f438f732d668e.pdf?index=trueIn PDF document text
    • http://tapepoxawire.epizy.com/zesodaxim.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_26690e24df4144869243b02993aa8b91.pdf?index=trueIn PDF document text
    • http://lakivexa.epizy.com/xifepumusevalulopip.pdfIn PDF document text
    • http://laxolivavaru.epizy.com/f2_acca_notes_free_download.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_d96abf3bda694b4b9bc0be7544566bcf.pdf?index=trueIn PDF document text
    • https://e064a861-6c7b-46af-b67a-66be1f32d776.filesusr.com/ugd/ec3e4b_3a8a8779a5094e9fa3edeffeb84a8d7c.pdf?index=trueIn PDF document text
    • http://wepelefil.rf.gd/iphone_x_security_vs_android.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_02e081996f6a4bab8de4f5ecb8e16eff.pdf?index=trueIn 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_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 5544 bytes
SHA-256: f2b6f59071fcea44de09e9d4f0caf533e8804d88d1c19c2f0c32d1d5bb1dbf93
font_01_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 10584 bytes
SHA-256: 8a69ae5b7ad11208242a3d32fbb6a10d0f1c19b7338dd91a41fc12332923ff86

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