Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dad7da5f7c7d7b…

MALICIOUS

PDF

60.3 KB Created: 2020-12-20 11:22:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ce65f89d3f55112fd2b96a010634e9bd SHA-1: d31f099ba80bb301b8b3430a6bac278498ad2995 SHA-256: a8dad7da5f7c7d7b0e2032a8d6eac2be24254236d413feef81ed59c92acd21a0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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://traffine.ru/strik?utm_term=northpoint+adventure+gear+tent PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469105/normal_5fc18d4853ee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_5f8b53047bc35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5fdbbc3fb199c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_5f9cd10b23f96.pdfIn PDF document text
    • https://bawapumur.weebly.com/uploads/1/3/4/4/134466187/moniraderam-webosedorobi-ripisaleje.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/4c6f4843-7cff-43ec-882d-59c6619323e2/fast_facts_palliative_extubation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8447c186-c7fd-4354-8ce0-4fdc7a91d4e9/zexajemododitazerukop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ae53405d5340f34a5a85/t/5fceda5605f6f278074976f9/1607391831516/rizekepelekimawumomes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf258af-72c3-491d-858d-369fa6bb15e9/angiosperm_vs_gymnosperm.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc9c274a508b35dd5dc321/t/5fdca20838e73f2e3d7965fe/1608294920660/potum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44df877b-aa61-4b6c-aeb3-7dd07d0cce2d/45992220749.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_off0000af44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF44 5040 bytes
SHA-256: 1494494a7053c5bd7b1c0b62e6913059bd8772cbf80a4771239c9fd7e2fc8a93
font_01_sfnt_off0000c073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC073 10508 bytes
SHA-256: f513092fef593ada93e2093ce9d9375bc845da855bd40e42d3ccec8a47075c16

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