Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a81118f17c5ee7…

MALICIOUS

PDF

76.1 KB Created: 2021-02-19 08:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b790808dc8f292e239e19f35a95ea9e3 SHA-1: 6d4ed8972cb91ede33861d695f5cdea9b94b5f7c SHA-256: f0a81118f17c5ee75bb967db3911fa788c7cf1e5fe7b34a572ef478f48f9b32c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute multiple malicious links. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=tippmann+a5+barrel+thread PDF link annotation
    • http://ig-soft-team.com/photo_editor_android_app_githubxwck3.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/1JAekyW/sukosamo.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/hjjahdE/zuxolozuwun.pdfIn PDF document text
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/6c16fbb.pdfIn PDF document text
    • http://haustova.com/bakibazoxoxepakarcn0ie.pdfIn PDF document text
    • http://redita.fun/26953609351hhgiy.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/retifokaz.pdfIn PDF document text
    • http://heymama.store/2934278056g9ifl.pdfIn PDF document text
    • http://investmag.org/film_korea_cheer_up_mr_leer4f7o.pdfIn PDF document text
    • http://topfrag.rip/kick_the_buddy_forever_game_downloadko2n3.pdfIn PDF document text
    • https://raxuremaxu.weebly.com/uploads/1/3/5/3/135350699/1309900.pdfIn PDF document text
    • https://faxasuxudoxo.weebly.com/uploads/1/3/2/6/132695360/1861145.pdfIn PDF document text
    • http://lorenbayi.com/woxekifovarmv77.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/musoxifuvitalo/83740040613.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/maths_worksheets_year_8_fractions.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/67833483197.pdfIn PDF document text
    • http://jarexuvi.epizy.com/2127663258.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_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 5232 bytes
SHA-256: 1d58b74eb9c4468047d71c76bb47c894def815b39a179a70682bdc0a4da446d3
font_01_sfnt_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 10648 bytes
SHA-256: 74f751bc9635b39abac834f2c51053e9268ebd29910c0a5911f74644173ed5ea

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