Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a6cf763edf725f…

MALICIOUS

PDF

82.5 KB Created: 2021-03-01 16:21:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6d3fca5dafacf04187b8ee85369b96de SHA-1: d4a1569e42d80d94ca81535cf6d2540379bf7e38 SHA-256: 76a6cf763edf725fb0e191ab87c0ca410ddee6d5b3a407a81ac8badf5a3f52c3
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, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. The embedded URLs point to domains such as 'nipisod.ru' and 'esmoney.site', which are likely used to host malicious content or redirect users to phishing pages.

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://nipisod.ru/123?utm_term=is+cooking+merit+badge+eagle+required PDF link annotation
    • http://esmoney.site/figure_drawing_classes_near_mer8ky8.pdfIn PDF document text
    • http://msertis.xyz/arturia_microbrute_se_analog_synthesizer_redeo0ih.pdfIn PDF document text
    • https://cdn.sqhk.co/giwegulatil/ietPaet/league_of_stickman_best_action_game_dreamsky.pdfIn PDF document text
    • http://bluebadge-support.com/aprender_ruso_gratis0im0g.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazekerubu/gjghjcS/firijiwom.pdfIn PDF document text
    • http://clebohets.xyz/87958154822ycg71.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/38e5686b.pdfIn PDF document text
    • https://bonuwokepav.weebly.com/uploads/1/3/4/5/134592975/dotobezulasamutul.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/bheRicC/zombie_hunter_dead_zombie_survival_shooter_games.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/6lgihfY/masukefanedasawilofus.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/wiwamoxamo/sedeperitus.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/29466234386.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/boro_chele_natok_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/1177179724.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_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 5524 bytes
SHA-256: fee624ae2af10524e6c3a93830c4df98549680afb57adca0e11cacd913708f90
font_01_sfnt_off00011441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11441 12916 bytes
SHA-256: fb971df0346d27cbde46e1a03186bb39eeb2195ceae7766ceaf75cf097715498

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