Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84e11bd764d0c78…

MALICIOUS

PDF

70.3 KB Created: 2020-11-16 17:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 635dd5c45f4ce4938033f5c6340bb04b SHA-1: db5461a5b6464d4d56cc2945e4c75e6997e693e8 SHA-256: f84e11bd764d0c78aedb0d7b5cf9d5c19ac6e6d4f42e2641b4899aa74429cf91
156 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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=puerto+rico+travel+guide+book PDF link annotation
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/kawepumesubanew-jadipeb-gidovunetesamuk.pdfIn PDF document text
    • https://sojejizewo.weebly.com/uploads/1/3/4/4/134460985/nizupumopug-pawapolivuke-delem-ziked.pdfIn PDF document text
    • https://pekedilude.weebly.com/uploads/1/3/4/3/134324883/9015489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_5f8ee4e2c54fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_5f9bee8377cf2.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/ginebomumazowed_molawadidif_kuzopap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_5fa1bbb1d0701.pdfIn PDF document text
    • https://sivipafegedijog.weebly.com/uploads/1/3/4/4/134443607/3909659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f8f1f2bd5646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sigobija/torch_lake_houseboat_rental.pdfIn PDF document text
    • https://s3.amazonaws.com/pojojagajevuxa/louisiana_class_d_license_study_guide.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_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 5192 bytes
SHA-256: 19fed15866f1bf31d25bf497eb34c79d76e761497646b78ab246666123467a6c
font_01_sfnt_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 10580 bytes
SHA-256: cba6b9be2e8abd840f95c2e072049cb32993f33ea13cf06c390b3cdf18d44033