Malicious PDF — malware analysis report

Static analysis result for SHA-256 58baea2b6713fdc6…

MALICIOUS

PDF

72.9 KB Created: 2020-11-13 19:15:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 12a1a7941224bcb837d5d64b6e31208e SHA-1: e51b6f0cc5d9a3a58c124a588bc7d2cb1aacdc58 SHA-256: 58baea2b6713fdc67026f9860975386c6fac68508e3627a34389bab358de52bc
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm and an SEO redirector, specifically pointing to 'https://trafffi.ru/123?utm_term=fly+tying+bench+diy', which is likely a phishing or malware distribution URL. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=fly+tying+bench+diy PDF link annotation
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/3601487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413013/normal_5f94bbe69b428.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/bitenafowewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_5f8e274c75b7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383678/normal_5f9bb170c0d7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_5f8eac3767dd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f9414411ca09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_5faade495ca0e.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/206577b2-80e8-4e0e-b272-acf312e368d8/dadufenidopomev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea816730-8894-447e-aadd-3d605b2136cd/43612994809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d99f9b96-0676-4dff-bb39-29bc64efc4cc/xemete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b45da9-d769-4b7a-a9a2-16398b6ff17e/self_appraisal_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf32e7f6-2a86-4ba5-9415-c71522864e12/bibovuzowofak.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/fupibukepe.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/winebuxoselokoxum.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 4912 bytes
SHA-256: d140cd778efa605a86fb995917402fe771a9e70d41d450118ea99c7a8a9eb6d8
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 10204 bytes
SHA-256: e860e74d9e9b998a4a176e45a1996476fae41642eb3c8276c7f5b2fd111d6173

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