Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f4da5da19dfbe2…

MALICIOUS

PDF

69.1 KB Created: 2021-03-20 06:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b7e4924c9caef7f979a89b1980713ecc SHA-1: a53c0260d0d303c066f8aeba4889096522907f64 SHA-256: 27f4da5da19dfbe2113d22340a3bccd87ab17f45599da86e2a472e92f6bf3e0a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm or phishing lure. The document body is heavily obfuscated and contains metadata related to 'wkhtmltopdf', which is often used to generate PDFs from web content, further supporting the link farm hypothesis.

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://jumiwimov.ru/strik?utm_term=honda+hs828+snowblower+parts PDF link annotation
    • https://cdn.sqhk.co/defisepeniba/gj7hgid/ball_bounce_and_sport_ashland_ohio.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/tiejohI/52545849207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_601dae17d8cdb.pdfIn PDF document text
    • https://cdn.sqhk.co/kopuzeginev/KjaXCSI/call_of_duty_warzone_free_to_play.pdfIn PDF document text
    • https://cdn.sqhk.co/dasupejej/aP42yhb/gusaxovir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426971/normal_6024539217550.pdfIn PDF document text
    • https://cdn.sqhk.co/vafizolubev/JggUtDk/30422472467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393628/normal_5ff418e814d3c.pdfIn PDF document text
    • http://padojuputiki.iblogger.org/bajevedafofujagob.pdfIn PDF document text
    • https://cdn.sqhk.co/poladejug/ficgikS/xumijakopabejemarotubuja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_38d25e6464194b9f9bb07cf19a122de2.pdf?index=trueIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_55be6e8276da4e6e89b2ca2420fc8f55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/how_to_put_actiontec_router_in_bridge_mode.pdfIn PDF document text
    • http://bovubibuba.epizy.com/rt-n12_vp_default_password.pdfIn PDF document text
    • http://godimodasixor.rf.gd/best_black_friday_deals_on_beats_studio_3.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/disgaea_5_strategy_guide_download.pdfIn PDF document text
    • http://noborixujap.epizy.com/aha_stroke_guidelines_2020.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_off0000cdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD5 5564 bytes
SHA-256: 9a0817667950c200a052d96ef11c60a1cd80b615bcc7cb6015554785f559d453
font_01_sfnt_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 10928 bytes
SHA-256: 55db1aeba18ffd3438d835baf6c300c93b9ee5b662ac346922fdb5ab97764eb7

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