Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fee270854d6090e…

MALICIOUS

PDF

79.3 KB Created: 2021-03-11 13:51:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63a0558f860cb923c52a536c29b83fcd SHA-1: e0fef757209c7a68e2739ded78d39dfcded79909 SHA-256: 9fee270854d6090ed736b24ac17f9d67fc15759f0cf90f6c8d4db952a9261487
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://golowaki.ru/123?utm_term=excel+2010+create+list+of+sheet+names
    • https://pemolopudamas.weebly.com/uploads/1/3/4/7/134753943/bojoxileza.pdf
    • http://vowogibex.22web.org/gowoji.pdf
    • http://tb-films.ru/malakifrvcw9.pdf
    • http://tlgfree.xyz/sabufukeloxanuvubejixins3pnt.pdf
    • http://mavpa.fun/how_to_use_simplex_method_in_linear_programminguaksy.pdf
    • https://jugukibe.weebly.com/uploads/1/3/0/7/130740256/1a90832baba107.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_e5b69de3f56e44148d1c63af5165f2c0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/583226bb-a980-47cf-8238-c6aa5bbd18b8/68125470056.pdf
    • https://uploads.strikinglycdn.com/files/e705f28b-5a42-4c38-bf28-0914b3ecdd5a/french_vanilla_iced_coffee_with_cream_dunkin_calories.pdf
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_ccde2131ec454f66b6bc66a5d8858cdd.pdf?index=true
    • https://s3.amazonaws.com/pirosisob/perinizopezutufamak.pdf
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_344f77e181ab40ccad29c3d98911b00c.pdf?index=true
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_d3895a11c6924ba39439bd2809b8442b.pdf?index=true
    • http://mevediruzorapaz.rf.gd/sabaton_carolus_rex_swedish.pdf
    • http://pejezal.rf.gd/71687411215.pdf
    • https://s3.amazonaws.com/fupanabivote/61809553760.pdf
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_db25bb55534d4db3a5c8b9af5ae22937.pdf?index=true
    • https://uploads.strikinglycdn.com/files/59cd4dd3-33fb-4456-9b46-5e35b228372a/what_does_the_pin_symbol_mean.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c6.bin
044a09a035a76877d30f0a6bdd5356ce0423233b3794e391f9e5809b112cbaaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 5472 bytes
font_01_sfnt_off00010b48.bin
c404349100815e92b2a55875bdd6fd67c00229ac39ea188fc7c151a44476377f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B48 10592 bytes

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