Malicious PDF — malware analysis report

Static analysis result for SHA-256 9217bd24417a522b…

MALICIOUS

PDF

76.2 KB Created: 2021-03-23 23:21:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7590bf76e529d78b49f800a585218506 SHA-1: 041ee48a9fc9e93c62a5364300f3b5056cd6b594 SHA-256: 9217bd24417a522b04416fa25b3af267a1b3e27ae1bde88b05bd1ec606a36d5e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to SEO-optimized content farms, indicating a phishing or link-farming attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://gimoguvi.ru/wix?keyword=manual+to+automatic+transmission+conversion+kit
    • http://mevixonur.mywebcommunity.org/norton_anthology_of_short_fiction_shorter_8th_edition.pdf
    • http://nakidki-alkantara.xyz/how_to_play_sorry_fire_and_ice_instructionsxef4x.pdf
    • http://bcpreactiva-enlinea.com/619353262173n2rm.pdf
    • http://liwurivosopap.medianewsonline.com/vulawagekifitifedor.pdf
    • http://options.expert/perubawugofanikawowuti7v845.pdf
    • http://maewallace.com/sunekazugugipebavyozpk.pdf
    • http://tacfitproducts.com/java_tutorial_videos_freetp0h9.pdf
    • http://datinge.site/46089168175u17vj.pdf
    • http://hocostyle.ru/gufufokuki3qy.pdf
    • http://rexonina.medianewsonline.com/how_does_a_mountain_lion_adapt_to_its_environment.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_b135ee6333d1454894cb03f906c58a25.pdf?index=true
    • https://s3.amazonaws.com/luropi/dunixigodemo.pdf
    • http://tanonarimunal.myartsonline.com/kebuforirarugof.pdf
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_25eb1bdffba345bdb869eff4ef2dda98.pdf?index=true
    • https://s3.amazonaws.com/lemerisinivum/light_novel_app_for_pc.pdf
    • https://s3.amazonaws.com/najubu/98952867218.pdf
    • https://s3.amazonaws.com/rizezobabub/94055717184.pdf
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_5594167645d24ae6834058a9c5212390.pdf?index=true
    • https://s3.amazonaws.com/zarelusipofox/36862579208.pdf
    • https://s3.amazonaws.com/wazotojemov/7160486858.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_off0000ed5f.bin
db8967a42b841244ab3eb1fdeb3494f6b6f55cf9615d0f624cbbb4274101388e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 5076 bytes
font_01_sfnt_off0000fe9e.bin
0096fb0fad249d1efbc41e0c113736fbc00b0c4f765fb927c305d41abf9f8a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 10800 bytes

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