Malicious PDF — malware analysis report

Static analysis result for SHA-256 a751cc5381b91bde…

MALICIOUS

PDF

102.8 KB Created: 2020-12-27 22:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d33b811b30bdebc98d8d71c8a9b867ec SHA-1: 96d371550f2ab62ad58ab348b2be17179d55e627 SHA-256: a751cc5381b91bde44767815946f8612bbb2147da73fa27fb40749ac1389eee2
186 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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs is 'https://traffking.ru/123?utm_term=green+mountain+boys%252Blist+of+names', which is likely part of the lure. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's designed to redirect users to potentially harmful content.

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
  • 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://traffking.ru/123?utm_term=green+mountain+boys%252Blist+of+names PDF link annotation
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/2425b5e6d217ba.pdfIn PDF document text
    • https://cdn.sqhk.co/xetajikok/jcshwjg/2020_remixes_of_popular_songs.pdfIn PDF document text
    • https://boderaraza.weebly.com/uploads/1/3/1/4/131454415/zitarovinut_limonodo_fapasa.pdfIn PDF document text
    • https://jobeluke.weebly.com/uploads/1/3/5/3/135318189/3857069.pdfIn PDF document text
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/majevena-vumefikimej-meguwonagun-bokabax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379498/normal_5fc90c273e011.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/3092833.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461766/normal_5fad7bae27396.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/19fbebd7-b3f4-4689-be24-66e27812b98a/vivifanoresomawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8618810b-774e-401e-b875-5f65bb2e2e9c/zatum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fdf9b8-9c1e-42ee-8cb6-8ac1fe8aca80/emotional_intelligence_2.0_full_book.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_off000154b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B3 5188 bytes
SHA-256: 2f127c38826419850ffe57bff7953babc9508114b9822b0e35999d26fd0818da
font_01_sfnt_off00016649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16649 11768 bytes
SHA-256: 9a703b015afc5167844c3581ba9e1bdc8b209f975c0387661302a9ab60d419da

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