Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b6b8bf7932d284…

MALICIOUS

PDF

76.4 KB Created: 2021-06-02 11:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 40953a516caa4103c9a27ec32310d7a3 SHA-1: ffbbbe6dda1166a721b5792219febf6befd23923 SHA-256: 46b6b8bf7932d284932fa67a6d009ab656398fd6eddd1651a97678be3b68bc8d
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to various websites, many hosted on disposable domains. The document's content, though heavily obfuscated, suggests a lure related to 'Florida boater education temporary certificate answer key'. The presence of ML and ClamAV detections, along with the PDF_SEO_LINK_FARM heuristic, strongly indicates malicious intent, likely for SEO spam or phishing purposes. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://oniceh.ru/pbw?utm_term=florida+boater+education+temporary+certificate+answer+key PDF link annotation
    • https://zobanegasub.weebly.com/uploads/1/3/1/1/131164549/27961a3.pdfIn PDF document text
    • https://kunokepipadiri.weebly.com/uploads/1/3/3/9/133997431/3102308.pdfIn PDF document text
    • https://bokojisegozesu.weebly.com/uploads/1/3/4/4/134479890/sabiv.pdfIn PDF document text
    • https://divisekul.weebly.com/uploads/1/3/5/3/135347680/sijewovopibi.pdfIn PDF document text
    • https://xitodilizunew.weebly.com/uploads/1/3/4/1/134108755/zariduwadurolulage.pdfIn PDF document text
    • https://bojumojomugo.weebly.com/uploads/1/3/4/8/134850871/5105633.pdfIn PDF document text
    • https://kosafozusatav.weebly.com/uploads/1/3/4/3/134308791/nukudajodu-xamunopikemije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445739/normal_601241f3b32c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_602dcee8c47ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_6034d1bc58789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424672/normal_60171d94ea046.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://letonepamusi.pbworks.com/w/file/fetch/144435108/asme_y14_5m_2009_free_download.pdfIn PDF document text
    • http://jeselivid.pbworks.com/f/etapas_del_desarrollo_psicosexual_de_sigmund_freud.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/w/file/fetch/144490455/pomujevesugusuraku.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144500709/96269306875.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/93668997933.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144474330/espaol_dieta_de_1200_calorias_del_doctor_nowzaradan_en_espaol.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144421374/9768212217.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_off0000ec97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC97 5652 bytes
SHA-256: a8c1cb0d4f23b6706168da55d6c1ecedf48ceba959658ebc1055c9d47cb69d08
font_01_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 10616 bytes
SHA-256: eb989cfaa0c35277f68b05194a1040987a825b0e44b91e7fed09f0ce1a02f96a

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