Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c8bdf4394515b6…

MALICIOUS

PDF

85.0 KB Created: 2021-04-11 21:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cea3d22019c99f6db85c1e6f3d8b8adc SHA-1: 453590291c14480ffe831cfec0c8f153bf7f43a9 SHA-256: b0c8bdf4394515b6a29b77b0ced2d68ddbe104e93b688813f8d6d3c972b158f0
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/strik?utm_term=what+does+the+word+dos+equis+mean PDF link annotation
    • http://yewes.fun/sefikipifikivufemevinuobukd.pdfIn PDF document text
    • https://dojoxokixen.weebly.com/uploads/1/3/4/8/134878929/vuzisavobil.pdfIn PDF document text
    • https://getelomivono.weebly.com/uploads/1/3/0/7/130776590/8266223.pdfIn PDF document text
    • http://sparzha.club/18737018651yligo.pdfIn PDF document text
    • https://laganavixafalos.weebly.com/uploads/1/3/5/3/135341912/4851881.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/sikaberotur-bidobixofuzuje-nezutawov-dabugixo.pdfIn PDF document text
    • http://goodshopsales.xyz/2010_cpr_guidelines_aha30o8h.pdfIn PDF document text
    • http://rivalo130.com/ibn_arabi_society_youtubeuz9dk.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/2610058.pdfIn PDF document text
    • https://bewevirat.weebly.com/uploads/1/3/1/4/131437926/rujan.pdfIn PDF document text
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/gefopivijirixizipolo.pdfIn PDF document text
    • https://pafetinavip.weebly.com/uploads/1/3/4/8/134868030/3045955.pdfIn PDF document text
    • https://dirasikazeta.weebly.com/uploads/1/3/1/3/131379856/gabifiziti.pdfIn PDF document text
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/930dc39ee2.pdfIn PDF document text
    • https://xasavogo.weebly.com/uploads/1/3/1/8/131856096/sireke_mozowoxorunen_zesafanavutu_rosuvibaj.pdfIn PDF document text
    • http://sportplays.ru/can_a_cancer_and_capricorn_relationship_work7h5vt.pdfIn PDF document text
    • https://tagelararejo.weebly.com/uploads/1/3/4/8/134846357/lonikurona.pdfIn PDF document text
    • https://tovakuroxi.weebly.com/uploads/1/3/1/1/131164121/1741380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_7b794e18e8634af2bde09283f8141935.pdf?index=trueIn PDF document text
    • https://074643ac-29bb-4c22-9a1a-067596bb6989.filesusr.com/ugd/3254bf_9e0434582cdd4aa49f5299e51ff87f7a.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_583f4b4d18354de98207e50e3ffc3ddf.pdf?index=trueIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_3d8bd81bd96e4b84875ba18bd4269737.pdf?index=trueIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_423e855995da425f83e25af9cf08d363.pdf?index=trueIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_ce1fb3290fcd4260b0ae79033af25b62.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_124c8be9ee7d4cb3b9807436c3b40946.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_off000110a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 5264 bytes
SHA-256: 2676c5d4ed34864d394d08514837efb931f52611b82427384d0564131c89662a
font_01_sfnt_off00012273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 10372 bytes
SHA-256: 175ff1b96725c1e0efa4e2b1f02c9af7c06e01495d501da84d48ea246098baf2

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