Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5d9b844d3d6537…

MALICIOUS

PDF

68.4 KB Created: 2020-11-17 18:21:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c5004b4f7a5b7b303d0bcf2525159502 SHA-1: b3c88179a86149ec6050a9f0b1df0907aa0a4730 SHA-256: be5d9b844d3d6537df73341aa0bdabd9f957265bf023a29d7363ec17f0cc9adc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and the presence of external URIs strongly suggest this. The ML classifier and ClamAV detection further support its malicious nature, flagging it as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to drive traffic to potentially malicious content.

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://traffset.ru/wb?keyword=machine%20learning%20algorithms%20pdf%20jason%20brownlee PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5fae9b8c50520.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/gowimeter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_5fa1f0e890e65.pdfIn PDF document text
    • https://werikaduf.weebly.com/uploads/1/3/4/4/134483952/8803899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447450/normal_5fa734b402c9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_5faec85d95e4c.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/95ea5d4c-c47a-4704-b953-c4ddbd4e7db0/fepiniwi.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/mtg_rakdos_aggro_standard.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/math_answer_key_finder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5117cae6-3d45-4800-a7e9-655e4ba3d62f/tobozemamepudewojol.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/characteristics_of_animals_and_plants.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/gear_up_clash_of_clans_archer_tower_req.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_off0000cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 5884 bytes
SHA-256: 95287e9331883f674f35b2277fe113430e436c3a20a74bb91cedf951b9ad0e46
font_01_sfnt_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 9648 bytes
SHA-256: b6e421c59643d6ebb525dc01fc75825484e2ab6dff89c787768a8d2ba143ad75

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