Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49cae941a7dffd5…

MALICIOUS

PDF

78.9 KB Created: 2021-03-25 21:50:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 183037361721481acab5b833e9f78256 SHA-1: 22e3c4592c69df37cb5334a62c3a306119ba31f6 SHA-256: d49cae941a7dffd5082687db6e7abd5aef195e3b7e893b28a9779b64c01d7369
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest a potential distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=english+grammar+book+grade+4+pdf PDF link annotation
    • https://ketabanajav.weebly.com/uploads/1/3/4/7/134707818/853c2e42d494f.pdfIn PDF document text
    • https://noxurawikatiner.weebly.com/uploads/1/3/1/1/131163986/xowatexorijuru.pdfIn PDF document text
    • https://cdn.sqhk.co/fafojipedul/bHcbgiM/meme_soundboard_ultimate_2018_pdalife.pdfIn PDF document text
    • https://cdn.sqhk.co/vimanagadu/BHhfWhh/21606865969.pdfIn PDF document text
    • http://terugate.mypressonline.com/2035263763.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/iaan1he/drive_and_park_game_online_free.pdfIn PDF document text
    • https://dewubixire.weebly.com/uploads/1/3/1/3/131398231/gavesosumorinejonos.pdfIn PDF document text
    • https://ramilelajebow.weebly.com/uploads/1/3/4/6/134647205/kigaz.pdfIn PDF document text
    • http://datovufes.scienceontheweb.net/atal_pension_yojana_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/haichaz/amtrak_map_florida.pdfIn PDF document text
    • https://womizanoxagas.weebly.com/uploads/1/3/1/6/131607010/9457507.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/710059.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/cadenas_de_markov_un_enfoque_elemental.pdfIn PDF document text
    • https://tamilazubi.weebly.com/uploads/1/3/4/6/134604156/kudavolozelalin_nunizujopemitoz_pufuf.pdfIn PDF document text
    • https://puxajibixitukus.weebly.com/uploads/1/3/4/4/134457664/dedito.pdfIn PDF document text
    • https://cdn.sqhk.co/mugodetutag/dAFhijc/wipasa.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/jolunenafobuw/33678491078.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/catalogo_boticario_ciclo_8.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/90602681480.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/do_ikea_have_king_beds.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/39284835910.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/5043048365.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_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 5704 bytes
SHA-256: b4e3d73e0f04f81626f3f45785439f39b5394948ac2dd5fe870d9902572b531d
font_01_sfnt_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 11440 bytes
SHA-256: 1211316967926aee6b217147469047fef9231487296ce4ed33e78f415675fec4

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