Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98665cc1dbb5c90…

MALICIOUS

PDF

78.0 KB Created: 2021-02-25 19:03:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e0f5772be50a73363a2a96981f5f5bce SHA-1: 0838478371e051afae0cda98c2232358f41dd206 SHA-256: d98665cc1dbb5c90575926dbae2c25ed113924cd5dd5352ba3e60dfea5328f72
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm, containing a large number of external URIs pointing to various domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and the sheer volume of outbound links suggest an attempt to direct users to potentially malicious or phishing websites.

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://maypoin.ru/123?utm_term=warrior+cats+cats+name+list PDF link annotation
    • https://cdn.sqhk.co/bezakebijuk/jeAgv4h/kivoxenemekukigijuvabiki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376878/normal_600917200a329.pdfIn PDF document text
    • https://bagamijak.weebly.com/uploads/1/3/1/3/131380043/gipejopirifutel.pdfIn PDF document text
    • https://cdn.sqhk.co/mukujoripu/1rgddg8/82955068742.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/9V8iqJ0/download_game_stupid_zombies_3_mod_apkpure.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/bd4a48a.pdfIn PDF document text
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/farawenijuw.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/kotijaretovuvo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457570/normal_5fcea362f3975.pdfIn PDF document text
    • https://rinezafuwokof.weebly.com/uploads/1/3/1/4/131437641/6e199f4a3be39e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_5fe8818ad30c3.pdfIn PDF document text
    • https://vakogiguwowokel.weebly.com/uploads/1/3/0/7/130775334/pizofo_donilebojev_memimowureleji_tesefaj.pdfIn PDF document text
    • https://mikuzowadakan.weebly.com/uploads/1/3/1/3/131383480/xefamewejunobinipuju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakasis.onlinewebshop.net/how_many_months_is_nigeria_navy_training.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/46295930577.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/dyson_small_ball_animal_upright_vacuum_cleaner.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/74888757480.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_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 4960 bytes
SHA-256: f63e1a4f7548010c14295e5f6b87223270c7a5798653ea28582917e009d64ade
font_01_sfnt_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 10652 bytes
SHA-256: a58191f72e661b0de1b5966adbcb1ecb22d721953d9099b09453d2dd1a231526

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