Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a9b243a9a2fa5e…

MALICIOUS

PDF

76.1 KB Created: 2021-02-28 20:23:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1a25dc7793669490766fce0533f3f024 SHA-1: 1fbb7e92fb23239490664d4123f6405a4109a5b4 SHA-256: 09a9b243a9a2fa5e1fa8f23c5d508859654c8051964671b11fa6dfea2ea95a6a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical finding for a large external link farm and a machine learning classifier indicating maliciousness. The document contains numerous embedded URLs pointing to disposable hosting domains, suggesting a phishing or SEO spam campaign. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=beastmaster+durzag+guide+rs3 PDF link annotation
    • http://xuwuvewisin.mypressonline.com/intellifax_2840_not_receiving_faxes.pdfIn PDF document text
    • https://vemisalisak.weebly.com/uploads/1/3/1/4/131437925/72cfd327.pdfIn PDF document text
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/fc1a1f7ed.pdfIn PDF document text
    • https://pipedexow.weebly.com/uploads/1/3/4/8/134852679/lafixuj-katejimelawi-pobulidu-befopadirujo.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/75967123678.pdfIn PDF document text
    • https://terunutu.weebly.com/uploads/1/3/5/3/135319236/kufatitataj_tenuwaseturu.pdfIn PDF document text
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/vudumevu_malejowefexa_wupeguwoti.pdfIn PDF document text
    • https://vewosofi.weebly.com/uploads/1/3/4/4/134493368/4451832.pdfIn PDF document text
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/6273624.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/bajebatizalonebok.pdfIn PDF document text
    • https://xapiwelawuk.weebly.com/uploads/1/3/5/3/135341488/3634623.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/zomapomefe.pdfIn PDF document text
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/javojepodidirati.pdfIn PDF document text
    • https://nixabuvibowigev.weebly.com/uploads/1/3/4/3/134308208/naxum.pdfIn PDF document text
    • https://vurebinavusim.weebly.com/uploads/1/3/4/7/134714178/begubezaje-pixosaza-vamesipenikeket.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zifawikixeliba.epizy.com/pobomajolemiguxudixodos.pdfIn PDF document text
    • http://zajegugolex.epizy.com/61263117633.pdfIn PDF document text
    • http://derasowuras.epizy.com/formalist_literary_criticism_slideshare.pdfIn PDF document text
    • http://nimoxorud.epizy.com/8785446643.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_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 5376 bytes
SHA-256: d7bbc4822c57ce6add3d180914f5d65ad724510af37a0332b88d4925e0b8f914
font_01_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 10340 bytes
SHA-256: 8f7e098c9fb1603d892fd87dd75bf6fe2944ae63acc01999e068bcf101b58e2a

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