Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4d1d4b871d6da1…

MALICIOUS

PDF

77.2 KB Created: 2021-03-30 21:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a6a1aca747db50877b591182fa574c6 SHA-1: 237170fb9406416c45744aa544bb04c824ca5784 SHA-256: 4a4d1d4b871d6da1fb42baa5c9808908521e4746b9a5c78bc679b683b95223ba
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 hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of a 'homework answers app math' lure in the document body, combined with the heuristic firings for PDF link farms and ClamAV detection, indicates a phishing or malware distribution attempt. No scripts were extracted, but the extensive link farm points towards an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/123?utm_term=homework+answers+app+math
    • http://azakalaza3.xyz/87656363408logwa.pdf
    • http://reweder.site/1982910295bd6rq.pdf
    • https://cdn.sqhk.co/matikefateri/ahicggg/the_sandbox_craft_play_share.pdf
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/444208.pdf
    • https://zajewovebuvi.weebly.com/uploads/1/3/0/7/130739158/8997667.pdf
    • https://lirodute.weebly.com/uploads/1/3/1/8/131871659/401a352d1db.pdf
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/zekoxow_zedumemuki.pdf
    • https://cdn.sqhk.co/julukimesof/d4pihat/bupogosatugasidanogedi.pdf
    • https://cdn.sqhk.co/lowixadoges/b7hfOhj/corporate_strategy_salary_philippines.pdf
    • http://tryraisins.club/fazizuvo14m9.pdf
    • http://movilatur.iblogger.org/sezefoxazago.pdf
    • https://mufanujirube.weebly.com/uploads/1/3/5/3/135348440/ramadagizomiri.pdf
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/duwopa.pdf
    • https://cdn.sqhk.co/nogegamapagi/65hcFia/43741336850.pdf
    • http://money-team.site/seregugazesaresutenogphw9.pdf
    • https://jitemino.weebly.com/uploads/1/3/0/9/130969659/befarojupomutiv_zojesevixatit_bejoka_zixevifo.pdf
    • https://raketesi.weebly.com/uploads/1/3/4/6/134632322/6610090.pdf
    • http://idealslimitaly-ufficiale.site/geometria_analitica_formule_circonferenzal6l3n.pdf
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/nutisufolifaja_wuwakileburor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://rukevoseworo.rf.gd/microsoft_certification_courses_list.pdf
    • http://kutarefaworowur.rf.gd/lomubifinavewuvigawovite.pdf
    • http://gumigojozupe.epizy.com/arris_xg1v4_manual.pdf
    • http://pupovedifa.rf.gd/jokivenepukasalafevopus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a0.bin
e8c0091523b623c94612c63b21b65715c44b8f37c257d21aedaf6e5888a00f31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A0 4884 bytes
font_01_sfnt_off0000f403.bin
664127ec50d219a3a4de47732f781848c472c82cde92053569ce75e47ddb0257		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 10924 bytes
font_02_sfnt_off00011919.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 4324 bytes

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