Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6c91341a256c93…

MALICIOUS

PDF

72.2 KB Created: 2021-06-01 22:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f5e46c5b2334af38109d4a6e7f6cfe1d SHA-1: 5dad335a17eab519a1be3ae87a83f94a306445e6 SHA-256: fc6c91341a256c9319dcdd19277eebae84b876f4290e30cec9332634e8d8a726
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The embedded content, though heavily obfuscated, likely serves to disguise the true nature of the document and facilitate the redirection.

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://pistant.ru/pbw?utm_term=mixolydian+guitar+licks+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473619/normal_601af69ee8b4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379615/normal_5fcb312114578.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/gigomuk.pdfIn PDF document text
    • https://wagezulixi.weebly.com/uploads/1/3/2/6/132695300/6718595.pdfIn PDF document text
    • https://kuratiwupojaxu.weebly.com/uploads/1/3/4/0/134017491/3849373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_602b53ca336e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466657/normal_600a3afbb7c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_600ced9773087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378383/normal_6056090adf781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nilanom.pbworks.com/f/5487441955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bd06b7b-8a1d-4197-8627-ba42a7ac8d3e/hp_officejet_j4500_driver_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5110fee9-b520-48c9-a391-0266f87769c2/91188594677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b633db-41e4-40a2-b934-0d0c570f88b4/can_i_use_jolen_bleach_while_pregnant.pdfIn PDF document text
    • http://fevosezew.pbworks.com/w/file/fetch/144474831/1_kalima_translation.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/8_ball_pool_hack_coins_software_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639fa1f9-b886-4323-a1c6-46f21bf307ca/tunozivixade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a631ef8-9966-4e49-98c6-b3dbff2e4722/32735176799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbc93ca0-893d-4f7b-9c1a-ca14942733ab/braun_tassimo_coffee_maker_troubleshooting.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_off0000da96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA96 5564 bytes
SHA-256: c19f028361ab64023271e81789f31075279681453dff074348b27b7d24c55493
font_01_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 10772 bytes
SHA-256: b2a6a57feb436b53fbff0e60a720732ae460910f04746cd2ba9a50e5568d8b9d

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