Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47fb50297050704…

MALICIOUS

PDF

73.1 KB Created: 2020-12-28 18:43:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 481a2faa657bde4d129be3fafb2e0e88 SHA-1: 5342f3ede8fb4ded726db73f84c7558220d1437c SHA-256: a47fb50297050704ae06722dcbda4799be201d47ed101a948e566f8ab5da22cc
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=try+to+praise+the+mutilated+world+new+yorker PDF link annotation
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/kevasika.pdfIn PDF document text
    • https://weratirotiset.weebly.com/uploads/1/3/4/3/134322017/8389331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460677/normal_5fe2bdd9c7158.pdfIn PDF document text
    • https://guzuzixud.weebly.com/uploads/1/3/4/3/134357052/jasinedoririwef.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/8e67fe06c6.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/56199.pdfIn PDF document text
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/zeten-mimijasetul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8699de52-5a83-4d61-8096-1f95e3118355/48293401619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3515470b-2b1f-48a6-925e-7d830a11fc56/28340608242.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/sales_analysis_report_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc40e3cc-b7b6-446d-be15-3214dc0f013b/budexik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c3cf946-f81a-4f2f-a5a3-2eb28ffac370/fedufegujo.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_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 5404 bytes
SHA-256: 61da16775688deff0c44a69f77c5209fe24d11bfd3b866f81d93a20d4a1b6350
font_01_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 10196 bytes
SHA-256: d0d5e4f0f5e20af69813c2fc866405fa0016f1b4e3d36425c98f31a22be7acd4

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