Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5d6ad2f4ac2119…

MALICIOUS

PDF

78.3 KB Created: 2021-05-16 02:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5aca844f6a7018244df972ff00205731 SHA-1: 2eb543f18132136b6e919cc2c389414c88cbcb84 SHA-256: bd5d6ad2f4ac21198125435c22245e548224162de60df9a625ca6402a4d8e6fd
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

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://kuzutuzo.ru/strik?utm_term=hp+laserjet+p4015+replace+fuser PDF link annotation
    • http://tavegumata.sportsontheweb.net/jadubawupaguvok.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/kovixemoguraziwexap.pdfIn PDF document text
    • http://poguzozod.sportsontheweb.net/51195294011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_60636f0a4f792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_60402b35c873c.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/bezab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_600f5fb1e1a0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448746/normal_5ff5694f369b4.pdfIn PDF document text
    • http://mevixonur.mywebcommunity.org/fusionner_2_fichiers_adobe.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/36acb8be-de1f-4dfd-aefc-3ead421050aa/cuisinart_custom_14-cup_food_processor_accessories.pdfIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_8459ace88560491e9628dd7e6f29ec3a.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_b1991e8535fe464ab7becdd700296fa1.pdf?index=trueIn PDF document text
    • https://c24d0846-efa5-4754-a822-a7dc8f88f2d4.filesusr.com/ugd/7b2abd_80176e206fdf4ed3af1ae178b66e5314.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9369b7-7685-47b6-9bff-3bf282be2314/deroxupirogamevubanij.pdfIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_d94d313eba92439bb4efb7255ad07524.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_30fad92069f24276aa5f3a99357cdf46.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_8a1e22b6c2114fe3851b000f4ad4ce4e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a2146c-4100-4729-a9c6-af14a9f2401a/how_to_clean_a_bissell_powerforce_bagless_vacuum.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_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 5452 bytes
SHA-256: 49612f2fbd3351721a00776cb76535c30141cfa8a4652e4594bbd52d1149b370
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 11144 bytes
SHA-256: 6e4c0428d57ecf623482d60c2d5c6eebb47a654fe48bf9b5ca1433d0dbbcbcf7