Malicious PDF — malware analysis report

Static analysis result for SHA-256 103b02431b7a89b2…

MALICIOUS

PDF

68.4 KB Created: 2021-01-04 21:04:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 78c604fa56a726f92b5984dde3deb1c9 SHA-1: ecab5c44161089902afc3e59a388a01e1fffa3ca SHA-256: 103b02431b7a89b260cac08959142ce9a2b3546725d3c9b78d82c0cbf0430023
244 Risk Score

Malware Insights

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

The PDF file contains numerous links designed to redirect users to external websites, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to "British English conversation pdf". The presence of a link farm and a critical heuristic firing for malicious redirector links indicates a phishing or scam attempt. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/aws?utm_term=british+english+conversation+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_5f9c9ccf47519.pdfIn PDF document text
    • https://wekimede.weebly.com/uploads/1/3/4/8/134862148/7749456.pdfIn PDF document text
    • https://xefapakofaguwa.weebly.com/uploads/1/3/1/1/131164324/6127151.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/jaraxewopoke-tixizexakixik.pdfIn PDF document text
    • https://dugitesabisaxo.weebly.com/uploads/1/3/4/3/134392589/5865565.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488555/normal_5fef663760bcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450864/normal_5ff321b21e35f.pdfIn PDF document text
    • https://cdn.sqhk.co/pidefatop/3ih5dig/hard_boiled_meaning_movie.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/5d6d4a5d-e185-4e22-a335-94ceffea9062/42776323472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed392ad6-ecc8-48fe-83f9-88e3f5ce8019/32000882921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e62e8c7d-439f-4698-b7c4-ffcc5cca9f7f/56189767616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6bff91-07c9-40e7-8c08-9d6f94668fa0/vurefomologibiromewojota.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_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 5524 bytes
SHA-256: 95131e68c58dfb0c5c9f164db916b92f41f10b9130db6769eb64142426a4b609
font_01_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 10352 bytes
SHA-256: bb33191382c644d21dec4a78aa68f1ca95e56cd0a7d03bb2df2ad852c3c069ab

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