Malicious PDF — malware analysis report

Static analysis result for SHA-256 a775acca7524c8df…

MALICIOUS

PDF

72.3 KB Created: 2021-04-09 05:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 33b391096682a334eaad21e4ca0c26ae SHA-1: e932fa6ed7afa4a06a36beaba6c72cc3b1a0e0ea SHA-256: a775acca7524c8df3bef930adbf2e9e2da80503859142bb2ec8d755524358cfc
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute further malicious content or phish users. The primary URL, 'https://jacksth.ru/strik?utm_term=cape+malay+cookbook+free+pdf+download', indicates a lure for a free PDF download, likely a pretext for distributing malware or leading to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=cape+malay+cookbook+free+pdf+download PDF link annotation
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/fetulu.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/xojumake.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/49b71aa7442.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/ribQifA/islanders_roster_2015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369781/normal_5ffa34f503c61.pdfIn PDF document text
    • https://kodalisurodufe.weebly.com/uploads/1/3/2/6/132680932/8015053.pdfIn PDF document text
    • https://cdn.sqhk.co/ruweragi/iburThh/mini_dachshund_puppies_for_sale_in_oklahoma.pdfIn PDF document text
    • https://zawanudodulir.weebly.com/uploads/1/3/1/4/131452903/eee35bac75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379602/normal_5fff4ae40c3c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_606916371629c.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/c6Lhhia/diamond_diaries_saga_levels.pdfIn PDF document text
    • https://cdn.sqhk.co/mapuvokunoj/kibjhgg/game_battlefield_4_apk_data.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/hy3KBMR/10122886735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475875/normal_6035086d1d2f1.pdfIn PDF document text
    • https://manujemupofux.weebly.com/uploads/1/3/0/7/130738512/fivijujipepaluzaniwo.pdfIn PDF document text
    • https://kunatelifarak.weebly.com/uploads/1/3/2/7/132712072/3635673.pdfIn PDF document text
    • https://nekazadezi.weebly.com/uploads/1/3/4/6/134662300/mewaviju_funom_lolazadobugude.pdfIn PDF document text
    • https://zaxavafu.weebly.com/uploads/1/3/4/3/134323176/fuziwesemok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_b9070c9eb9db4203bc7e91d3ee907a9b.pdf?index=trueIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_b8edbd567e3f456b82fc7fc0ce362c1a.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_1c9229c259f34f0eb4d6e052e95141fa.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_52e389d1d3a743f19084cd294076b212.pdf?index=trueIn 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_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 5424 bytes
SHA-256: cbdcb0c774a006054b4faf9bb6bffc1c5eb44ce04d43b34986ee308b665f285d
font_01_sfnt_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 10628 bytes
SHA-256: f3bcb8512988549899ed116a0b559849ce9eea63a024e9f69b71de02b37a1614