Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aee23134b4adcbb…

MALICIOUS

PDF

87.1 KB Created: 2021-06-06 07:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 138b942fc5bd82a26ce3eb158bbf814d SHA-1: a53802d5c98aeb3921436ac061dca52512fdf8a3 SHA-256: 1aee23134b4adcbbfea0c1c9d9ea69715034b1c58e6a9a226e81d271bb4e5fa4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://laborke.ru/pbw?utm_term=fortify+enchanting+potion+recipe+id', is embedded and likely serves as a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://laborke.ru/pbw?utm_term=fortify+enchanting+potion+recipe+id
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/8367171.pdf
    • https://litudawugo.weebly.com/uploads/1/3/3/9/133997631/fd6387.pdf
    • https://duvigenusidila.weebly.com/uploads/1/3/4/7/134736387/posawupagened-sewawevorido.pdf
    • https://gabejudunutulan.weebly.com/uploads/1/3/4/8/134887900/vugox-vanevozedob-safajawe.pdf
    • https://novenoberube.weebly.com/uploads/1/3/0/7/130776641/df66fe169c.pdf
    • https://basopuseg.weebly.com/uploads/1/3/4/7/134703880/6e0d69b73bb54f1.pdf
    • https://tudasuli.weebly.com/uploads/1/3/4/4/134403402/3514923.pdf
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/6151711.pdf
    • https://gatilavim.weebly.com/uploads/1/3/4/3/134391542/d7a58ec8c55.pdf
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/juriwebubakibopa.pdf
    • https://nipawivas.weebly.com/uploads/1/3/2/6/132680981/8371340.pdf
    • https://zuzefeza.weebly.com/uploads/1/3/1/3/131397950/11fa07.pdf
    • https://jevemiparo.weebly.com/uploads/1/3/4/5/134501543/400bec84a4e.pdf
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/c2028722820cf.pdf
    • https://kuxubujokug.weebly.com/uploads/1/3/0/7/130775750/b9320.pdf
    • https://gepubife.weebly.com/uploads/1/3/4/3/134315704/9dd6fe5240125d.pdf
    • https://nesamakamaxo.weebly.com/uploads/1/3/1/6/131636712/9f52bef0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pulixojesu.pbworks.com/w/file/fetch/144565032/what_is_the_coldest_place_in_the_united_states_now.pdf
    • http://negovijalulu.pbworks.com/f/rowuti.pdf
    • http://fadoposapat.pbworks.com/w/file/fetch/144476793/livro_400g_tcnicas_de_cozinha_gratis.pdf
    • http://sikovifif.pbworks.com/w/file/fetch/144471996/64026807618.pdf
    • http://tazijebep.pbworks.com/f/putob.pdf
    • http://jaxonewu.pbworks.com/w/file/fetch/144642984/uniformly_accelerated_motion_physics_ppt.pdf
    • http://detomipipu.pbworks.com/f/24294403207.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_off000115a5.bin
c1bf8c79bc26633250bd4dd9c6755a1cf88772e975bd47542db82a30404bd300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 5264 bytes
font_01_sfnt_off00012793.bin
4ed5d8802c5d1c51d57aba6456c2e2215e752c41073a433cc245948cf26a7f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 11548 bytes

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