Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a90607d4291832f…

MALICIOUS

PDF

88.4 KB Created: 2021-06-04 22:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 10d3263327128f5e9b741d3cab010e64 SHA-1: 5268132082f56b27b446c2fd96371e57fa590762 SHA-256: 8a90607d4291832f94e4efc9759ab36be4e1b855929c057639767aec8ca2b4b0
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a tactic to distribute malicious content or engage in SEO manipulation. The primary URL points to a game download, likely a lure for users to access further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://archism.ru/pbw?utm_term=download+game+varmintz+deluxe+for+android PDF link annotation
    • https://mawebexakonu.weebly.com/uploads/1/3/4/3/134390129/b2f09af6f5ff9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495707/normal_604ddc2ea1e70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_606813eb4e2a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_602c6da73d678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_6061a40d96f23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445882/normal_606910d0b1369.pdfIn PDF document text
    • https://fitimunelesim.weebly.com/uploads/1/3/4/9/134900430/bisajazaledo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_6054399a39abb.pdfIn PDF document text
    • https://wizakamulo.weebly.com/uploads/1/3/4/0/134017688/a1cfed215b2e4b.pdfIn PDF document text
    • https://devigafaviv.weebly.com/uploads/1/3/4/6/134698058/9885287.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417997/normal_5ffea2eed50b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mazibudikor.pbworks.com/w/file/fetch/144618696/cj7_english_dubbed_movie_download.pdfIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144557088/sosumazumapasu.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/8924148829.pdfIn PDF document text
    • http://gijorugisaw.pbworks.com/w/file/fetch/144504267/buxitexomefo.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/liriketinegajolurexoduta.pdfIn PDF document text
    • http://joxupakager.pbworks.com/w/file/fetch/144626877/14212889744.pdfIn PDF document text
    • http://vazesuna.pbworks.com/w/file/fetch/144500403/welding_technology_fundamentals_answer_key.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/f/how_to_play_cards_on_zoom.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 3236 bytes
SHA-256: 3dc5b0ec0f5c6f467f1d62cea28837f51148e28e9ad504889757b0a8567ede8a
font_01_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 5200 bytes
SHA-256: 44fdb8cce2c1484613e903aa6a3f6a97596c1b68157152bdb4b649192e6c8c26
font_02_sfnt_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 14688 bytes
SHA-256: 358bec307aeaf3831782cd8f6d636d9b30b2d08f6162424129b3bab3b5a8b755
font_03_sfnt_off00012fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB9 16176 bytes
SHA-256: 261d2b97f48e67c15ac20a51cdafbd113c5234f2c454e2f6320cb65b879b05a8
font_04_sfnt_off000144ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34