Malicious PDF — malware analysis report

Static analysis result for SHA-256 f982761d26e7c1b8…

MALICIOUS

PDF

85.8 KB Created: 2021-03-31 15:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6d36fe171ba71065c941c929aa9a523f SHA-1: d01e250eaa1684eb20cc8427c861d97c2c796610 SHA-256: f982761d26e7c1b85f5c89be3f2a167db51e3cb67f539c1c2728556d4eedd171
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/award?keyword=ante+nicene+fathers+volume+1+pdf PDF link annotation
    • https://ruragivelexodi.weebly.com/uploads/1/3/4/6/134663557/6248539.pdfIn PDF document text
    • http://zekabivalejasaj.22web.org/tufori.pdfIn PDF document text
    • https://dixodenifafazud.weebly.com/uploads/1/3/1/8/131856669/kezilajesapu-vuripulu-kusiloraba.pdfIn PDF document text
    • http://ejinaya.com/3rd_grade_math_worksheet_additiond5mrd.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/giwidaxer_dolemogef.pdfIn PDF document text
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/cf0cea95d.pdfIn PDF document text
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/vekufuzot.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/nepovurawobam.pdfIn PDF document text
    • http://copyrightviolationcenters.com/how_to_use_a_medicine_wheeleutjr.pdfIn PDF document text
    • https://remitibomuko.weebly.com/uploads/1/3/4/8/134853657/saxazo.pdfIn PDF document text
    • http://cadenalia.com/sound_meter_apk_mirrorhxg5u.pdfIn PDF document text
    • https://rewazute.weebly.com/uploads/1/3/4/6/134648352/2407416.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/savukojubusum/britax_advocate_70_cs_expiration_date.pdfIn PDF document text
    • http://filirepakej.epizy.com/18068774880.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/elementary_linear_algebra_anton_12th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d8216b-961a-4250-9736-62ff7b8537aa/twenty_thousand_leagues_under_the_sea_oxford.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28421b0c-0412-4023-82bf-0fbad4613d07/dewalt_pressure_washer_3600_psi_no_pressure.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/46699448066.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/dan_brown_robert_langdon_reading_order.pdfIn PDF document text
    • http://jebefufodapiwi.epizy.com/safety_hazard_symbol_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/84816173830.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_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 5496 bytes
SHA-256: 3d6c17133911352885fce36a8aabe5c4e2706c570b96de5ae606cac851821ea6
font_01_sfnt_off000123e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E7 11052 bytes
SHA-256: 7c7c2fed01f09bd7c83580f4120734d4561a83692251b85c69108806580e8b4b