Malicious PDF — malware analysis report

Static analysis result for SHA-256 816b6174c2ac0c7e…

MALICIOUS

PDF

66.0 KB Created: 2020-11-24 05:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5d6ccc0c158f07a29dab53fc9e7a320c SHA-1: 907d747c1e56460d400db180a1536bc1f672a9a0 SHA-256: 816b6174c2ac0c7e6b9e8f5ac07ac9253abd9f564513b8d11c5bf89acfa08c7c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDFs, but one key URL points to a suspicious domain ('trafffe.ru'). The ML classifier and ClamAV heuristics strongly indicate maliciousness, consistent with a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=comma+before+quotation+marks PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444882/normal_5f9e9629d71ec.pdfIn PDF document text
    • https://kemipopebu.weebly.com/uploads/1/3/4/5/134585234/julaponibeleluzifag.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/vepegesobixuvam-zotadimafawo-mimat-girozades.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/1491679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_5fbbca7919d57.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/edbc343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_5fb2f4c4d6626.pdfIn PDF document text
    • https://wunimebi.weebly.com/uploads/1/3/4/3/134361225/7741460.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/vososasoxumete/dictionary_download_english_to_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/65839410121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a82be9b-7209-497a-9bfb-484ab4c4bcb2/lion_king_online_free_1994.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/black_fitted_sheet_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/wefedibosus.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/66612185662.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_off0000c696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC696 5116 bytes
SHA-256: 4da369507b28a1869794a3977c18fdfe306182bace9937d899c6421cc5e01082
font_01_sfnt_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 10208 bytes
SHA-256: db2abe09798826d82c3978ae6088bf8a0d4a5c6b684e05829528293a9e44bdf2

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