Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5331cf665ba5398…

MALICIOUS

PDF

83.7 KB Created: 2021-03-11 23:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8963983b2fc8880147ca4a7a60ec6229 SHA-1: d73073e2cc82837eeb0e78b69b19486ef5c48453 SHA-256: f5331cf665ba53985088f6a4a3d84193447d573647d80ddd160c6b34af804952
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing campaigns. Although no scripts were extracted, the sheer volume of suspicious URLs points to a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://leonvi.ru/wix?keyword=merge+dragons+atlantis+quests
    • https://cdn.sqhk.co/sitopizol/OlhghfC/nail_it_meaning_in_tamil.pdf
    • https://cdn.sqhk.co/vaminika/jggjgGd/college_football_playoff_national_championship_predictions.pdf
    • http://malanefire.sportsontheweb.net/26614747935.pdf
    • https://static.s123-cdn-static.com/uploads/4383792/normal_5ff9f599c6377.pdf
    • https://cdn.sqhk.co/rigowodikot/gd1phgh/blackberry_os_10._3_autoloader.pdf
    • https://bigimenuxorotel.weebly.com/uploads/1/3/4/6/134655509/bakuvikenulenu.pdf
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5fe999fecb0cd.pdf
    • https://cdn-cms.f-static.net/uploads/4484807/normal_601570ce7c569.pdf
    • http://palikexifumalam.mywebcommunity.org/papapozabukuja.pdf
    • http://xoziduso.mypressonline.com/weredir.pdf
    • http://nipizakevenuvis.scienceontheweb.net/sozipasorupebibaz.pdf
    • https://cdn-cms.f-static.net/uploads/4417526/normal_6032106885a11.pdf
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/6791252.pdf
    • https://cdn.sqhk.co/sopiloroda/jfLojgh/adobe_premiere_rush_video_editor_pro.pdf
    • https://static.s123-cdn-static.com/uploads/4452609/normal_5fcf814a87d88.pdf
    • https://wuselusovofose.weebly.com/uploads/1/3/1/1/131164562/zezuveb_makamonuluta.pdf
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/51149315f1.pdf
    • https://zapizurur.weebly.com/uploads/1/3/4/9/134900478/lozawek-rekisegok.pdf
    • https://static.s123-cdn-static.com/uploads/4379848/normal_5fcbee3b532ca.pdf
    • https://cdn-cms.f-static.net/uploads/4374688/normal_600c406a91a20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vexolofifete.atwebpages.com/woxef.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001042e.bin
418e8759bf6c5b9291bc6fbd484d44d24ddeb1e8b554edc6b5b0bfd10e6f6545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 5124 bytes
font_01_sfnt_off000115aa.bin
9448820aab5c904136651b066121faebada8427659e2208454b3d4e0a938f093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 13820 bytes

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