Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac41fe5c78a185b6…

MALICIOUS

PDF

90.7 KB Created: 2021-01-08 08:18:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2e7357c2c6c35e5dce7e69ebc4f79b78 SHA-1: 47b20649928a55be8ca7c662de659c6d38d4d197 SHA-256: ac41fe5c78a185b6605465dca296bbf030715ff793f000402ac4e9b1e2d33dff
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=fasting+on+ash+wednesday+catholic+answers PDF link annotation
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/pipogowe-xenemezidaf-bukinebe.pdfIn PDF document text
    • https://cdn.sqhk.co/ganidabizi/Ahfgg9I/35801705119.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/6891120.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/hcicico/jofiped.pdfIn PDF document text
    • https://temegefa.weebly.com/uploads/1/3/4/5/134583031/sovikufafewolusivi.pdfIn PDF document text
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/pibubazivatuxuluku.pdfIn PDF document text
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/9030256.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/cceb0639-d7d9-41f6-aff1-76337dad74fe/vray_rhino_5_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/d_d_3._5_perfetto_arcanista.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/luvelurilowipirovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f953636-6848-4317-bac1-972bd7087e99/asvab_math_practice_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0c7a3f-a936-4bb0-b179-1d4e9752e48e/83535914388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4553c40-aa80-4cdc-85a2-9dba10133327/5381538209.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_off00012124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 5352 bytes
SHA-256: 4b13f3a674a1a5bfdd9143cf20830e2a70387dec08e69bdf26135434aac0eda0
font_01_sfnt_off00013369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13369 12992 bytes
SHA-256: a8c37c415ff8d8739bef946a4000bd769ccd119a0ff16e34138002bceeb9f859

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