Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6bfb084a32bbb4…

MALICIOUS

PDF

75.9 KB Created: 2020-12-11 08:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 321fa781c5440fc7f92b017b22c4778b SHA-1: 58c8bf55575fd02c6ee210e26cb4fa67b2a10d9b SHA-256: cd6bfb084a32bbb462fbcb2f7d0aab215e5ef87085090be5aaefc1a169bb9a3b
184 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to 'trafffe.ru', suggesting a phishing or malware distribution attempt. Heuristics indicate a link farm and a potential invoice/payment lure, further supporting malicious intent. Although no scripts were extracted, the PDF structure and embedded links are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/strik?utm_term=3+rivers+stadium+memorabilia
    • https://mutimerujufidi.weebly.com/uploads/1/3/4/5/134526942/cebdcf2.pdf
    • https://tukowozurowogof.weebly.com/uploads/1/3/4/4/134440104/5f8e2a8ab348972.pdf
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/1940142.pdf
    • https://zukigepuzena.weebly.com/uploads/1/3/4/5/134593101/rowewejufumagukidim.pdf
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/tejamunedefop.pdf
    • https://lonitavow.weebly.com/uploads/1/3/4/3/134355974/6ed37e.pdf
    • https://bubawupuga.weebly.com/uploads/1/3/4/3/134380130/fukopafuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pegebunov/66330986881.pdf
    • https://static1.squarespace.com/static/5fc115bd5e8e827d428ee316/t/5fc3bf05a97599144e6a883a/1606663941853/shallots_vs_onions_vs_scallions.pdf
    • https://s3.amazonaws.com/megujobemegor/87365030129.pdf
    • https://s3.amazonaws.com/mijedusovineti/xebikiposis.pdf
    • https://static1.squarespace.com/static/5fc54b94084698658e7b646c/t/5fcd35c6fe657040d59c7826/1607284168056/zazugazod.pdf
    • https://s3.amazonaws.com/vebogotexaf/google_amazon_app.pdf
    • https://s3.amazonaws.com/tudawufed/partes_y_funciones_de_una_celula_vegetal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ed.bin
3ea9dc0fe5daeba8b7c1286de8752a991578e51b79301a8010be3d8f06b4997c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 3080 bytes
font_01_sfnt_off0000ebf5.bin
2871ddeaafc5cb4797ea40f3371f5ec667008bdc9cf084a301e92ca329e7874b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 5240 bytes
font_02_sfnt_off0000fda9.bin
e464a4977786b212c8bb7f2a5f1bdc1f43ed2a45118328ddc55c5001cd846d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 11160 bytes

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