Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3f371db88362b1…

MALICIOUS

PDF

84.7 KB Created: 2021-03-19 07:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: cce5ade0a231f5a799f69d03019e6d30 SHA-1: bb23ed72160c9b50168495c16ec04f5977e4b105 SHA-256: ec3f371db88362b1afbd29fcc0f29b1279bd840f9a2c5f39cb36d039bc002e32
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external, often disposable, domains, indicating a link farm or phishing lure. Heuristics and ML classification strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/award?keyword=swot+analysis+and+pest+analysis+pdf PDF link annotation
    • http://50offshop.info/56683667715rklre.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/the_history_of_south_america_every_year.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_601732ce430a0.pdfIn PDF document text
    • http://testertumentum.space/42547610003m12zc.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/514113923655ac2l.pdfIn PDF document text
    • https://gafewifem.weebly.com/uploads/1/3/1/3/131379815/a2d4a3f4186.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/rolaf.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/50224992435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_604a67f7a8f07.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/mutuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404285/normal_5ff416761722e.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/viromibukoleliw/kopoxosi.pdfIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/xojefalajuwidezawerog.pdfIn PDF document text
    • http://zezofakarol.myartsonline.com/microsoft_excel_2020_formulas_and_functions.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_69c17a1a5c294f968ca6d3b593b30c58.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_7e12ea67b2bb4572a9746ab7a38c7d4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/tamawa.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_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 5236 bytes
SHA-256: a8c30b0b1585eb186fdbaec16a204d982b4ddcaf6dcb9a834511a5a40053c078
font_01_sfnt_off00011e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 11492 bytes
SHA-256: 215d10ca23363d349f5f33f7f6f5d956e032c7fe9c9a1757c28a333ca9bf66e7

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