Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b95380937737be…

MALICIOUS

PDF

69.5 KB Created: 2021-04-01 22:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 894f912a4c0881dee4e101fe6380ede3 SHA-1: 893b40a75be7e3d4a4288a4d721c20f8af824a8b SHA-256: 88b95380937737be851eaa4499fb880ecf0515bc94a8449dc32d78d3c32c1e55
186 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 0.9998

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://fokemale.ru/strik?utm_term=briggs+and+stratton+vanguard+23+hp+engine+parts PDF link annotation
    • https://cdn.sqhk.co/bokirebi/d1heR8v/94640862222.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/ajbZaCL/82935571646.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/qif9hds/kemaxeg.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/ibQNifB/midugixofugutagugaxiw.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/wefadep/gulukiz.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_0b3d392d17134bc2983afd655993df7b.pdf?index=trueIn PDF document text
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_e4fdf2f0148c453fbb009b54ac11be7d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5daa4c81-78ec-4c30-8fae-15d2c2c3648c/35188445473.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_25a03ad8d97b46619dc7281a675e4156.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/lifezelikovad.pdfIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_82d85b0c64994b1aa784d4ac7f96e6b7.pdf?index=trueIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_ec196b7b542043f0a5ad4e427f526ff7.pdf?index=trueIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_36e998c259b2427882107c9b996fe5b9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f517520-58da-4f77-9478-e84ae87cae98/symbolism_used_in_the_rocking_horse_winner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccae5f8e-7e70-4285-b934-c7afc0101962/mogukezufipokifinezex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7232adbb-4430-40ee-add0-8dd651e3e458/what_is_the_rainy_season_in_california.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_6a6b1532061349d2a005fa3b9930ddeb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/takateg/types_of_variables_in_statistics.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_off0000d24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 5596 bytes
SHA-256: 72b784a29633d9a3be62cf633604ef27a72f6724d3db3e0135da259d1be161a8
font_01_sfnt_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 10280 bytes
SHA-256: 5d9875140b83e7d3859ce71dac0904cd8ba613531eb87ff07e3155a4245d3af1