Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c18c06a3d3b829…

MALICIOUS

PDF

73.0 KB Created: 2021-01-12 19:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3cb47b53199bfea33e6a18d0f21cbaf0 SHA-1: 94dc3441e57e401220feb11c89854e1e26c94d55 SHA-256: f6c18c06a3d3b829b652dc92c458dde706e3b0a1fa1c14e226e1d8c422746a5a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a significant number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary external URL found is 'https://trafffi.ru/123?utm_term=how+tall+are+halflings+d%2526d', suggesting a phishing or content-luring attempt. No scripts were extracted, but the presence of numerous external links points towards a phishing or malicious redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • 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://trafffi.ru/123?utm_term=how+tall+are+halflings+d%2526d PDF link annotation
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/dfc57793077397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463306/normal_5fe383d405d3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5ffa80e9c2f04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5feeeb3b1a220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5fa6894c743b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382413/normal_5f9be0b680f14.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/jdnIidT/safitaket.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455370/normal_5ffdcede53023.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/xesigeze/reported_cases_of_zika_in_costa_rica.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_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 5220 bytes
SHA-256: 8cf93ec80ac134ce804d5e08c47b25519093d1f537299ca889e023951019b090
font_01_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 10516 bytes
SHA-256: 626e850dd6ce7c124280dea43dfccb15eaf4f8110f3d85d78babefa922526130

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