Malicious PDF — malware analysis report

Static analysis result for SHA-256 67567dd8dcb9c7bf…

MALICIOUS

PDF

74.6 KB Created: 2020-12-20 06:28:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b11cb3f60fcf13926ac8b5fe4248b0f7 SHA-1: 91381ef174826d712a4fc2c187c7d27fdcd0f782 SHA-256: 67567dd8dcb9c7bf1c8d7aa80f39991b6c0887059b71f65dca848f52e23dee16
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and an embedded URI pointing to 'traffnew.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a social engineering attack designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/strik?utm_term=wish+ender+quest+steps+2020
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/zerugijo_kebejanukuxu_gonejad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fde9718c66bff209e816f84/t/5fdeb0475809ae343402e436/1608429639627/pijilutazuxibikaxeso.pdf
    • https://uploads.strikinglycdn.com/files/d8c38897-ef09-47d8-9652-ca64b164576e/thrill_of_the_chase_book_fenn.pdf
    • https://static1.squarespace.com/static/5fc6d6f248c1673e559912ec/t/5fd1a575f2ee360040f5e244/1607574901838/inox_watch_buckle.pdf
    • https://s3.amazonaws.com/fejatepudopito/zezaruwolore.pdf
    • https://s3.amazonaws.com/fajeloninesitel/89277542890.pdf
    • https://s3.amazonaws.com/pazifetanegapu/93247185226.pdf
    • https://s3.amazonaws.com/takurugilij/92510257256.pdf
    • https://static1.squarespace.com/static/5fdc9ff03a83d042422c3343/t/5fdcb918f389365f1ac2ae31/1608300824901/kubetosen.pdf
    • https://static1.squarespace.com/static/5fdc79c85e71df64d6bd9c29/t/5fdcac93f2ceda4e83287279/1608297623871/nagugutukokaguwaxanikep.pdf
    • https://s3.amazonaws.com/tobojelusiwi/higiene_articular_de_hombro.pdf
    • https://s3.amazonaws.com/gezetega/85700571474.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e626.bin
f22271f582b1b7855c8b73cb5ddf3b1147a23703e1409f787f2f4e5eeb5b8f6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 5220 bytes
font_01_sfnt_off0000f7f1.bin
48fbb4a84e107b8c007d4b3b8b0ee3f67b097fd08c921aeb4ef3e06c1534a76f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 11164 bytes