Malicious PDF — malware analysis report

Static analysis result for SHA-256 06281c504c1c42c6…

MALICIOUS

PDF

76.5 KB Created: 2021-01-26 22:20:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9818bef778cf0ead88f8c1079f6dc9cc SHA-1: 95f4d447de061d1c6e34765cc23e4edd4cb5e7f6 SHA-256: 06281c504c1c42c692917e3914bb5692a8d765c8403c99e3cf2b0231b669dd3a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing lure, likely leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jottigo.ru/123?utm_term=principia+mathematica+newton+pdf+italiano PDF link annotation
    • https://mekaxojukana.weebly.com/uploads/1/3/1/3/131379168/fuvobagumapubefof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5ff069a83e4aa.pdfIn PDF document text
    • http://dawavuwera.22web.org/27567175325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388048/normal_60095e8161da7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_600f55c51b102.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/fumiposamisur/xovejubumufubawegone.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/ruvotosozoridajidid.pdfIn PDF document text
    • http://pasivete.epizy.com/ashley_furniture_industries_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/71912308714.pdfIn PDF document text
    • http://delixerilebuk.epizy.com/aetna_prescription_reimbursement_claim_form.pdfIn PDF document text
    • http://tolimimagag.epizy.com/dezibivodedapu.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_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 5312 bytes
SHA-256: c1aadcab6963e14682c8ad36ef19edc0d13775237d471b64db4db1152c91f28c
font_01_sfnt_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 11064 bytes
SHA-256: 13fc85918b296ddf0fe005b1a0405816d29ce2d9fc4310618c59768d35157621

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