Malicious PDF — malware analysis report

Static analysis result for SHA-256 b375e601450e9d5f…

MALICIOUS

PDF

73.0 KB Created: 2020-11-26 06:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2596130f02bef33a4290809ec7a27073 SHA-1: bc998e9788f355fbd651f01a88b45e6a9093327f SHA-256: b375e601450e9d5fd2a45d5fe339e437690685226ddf6d50ec9ab4b5ba5b0965
186 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 6

  • 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.
  • 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://traffnew.ru/123?utm_term=vinayaka+ashtothram+in+telugu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f89b206bec9b.pdfIn PDF document text
    • https://bipikutifegex.weebly.com/uploads/1/3/4/8/134868884/a8a44d4.pdfIn PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/9723125.pdfIn PDF document text
    • https://nufivinob.weebly.com/uploads/1/3/4/6/134682897/xubimufemosokomekili.pdfIn PDF document text
    • https://vipapesad.weebly.com/uploads/1/3/4/3/134369303/8170964.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/8223890.pdfIn PDF document text
    • https://lotuwuwobegeze.weebly.com/uploads/1/3/4/4/134476082/6ccf7e565f4be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5f98f3dd14b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f9b88f97fbee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/21044196064.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC419 5228 bytes
SHA-256: a117ce96f894227ecf3ee346345a824fa41981b5b12aff6d2d8ad5603c665965
font_01_sfnt_off0000d5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 9156 bytes
SHA-256: 40fcff0cb9b91593ea1179062a7d1bd7ff6447e9d0da852831267c16cb014bcf
font_02_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 11904 bytes
SHA-256: 421784280bf5a29d3a3fbe994b3966f59ccd15b8e6f433a06b055979e1129f8d

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