Malicious PDF — malware analysis report

Static analysis result for SHA-256 0090cca1c1bf4c9c…

MALICIOUS

PDF

78.7 KB Created: 2020-12-27 14:27:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39bebe33f519396df1fd95280e2c2fab SHA-1: 1303c7fb6dbecaedd4d8e1628c699eea8b0ff62e SHA-256: 0090cca1c1bf4c9c75330f2962f03f330d20ff1ebd440c01eb6d55b61c56d817
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm or phishing attacks. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, such as 'https://trafficel.ru/strik?utm_term=wwe+network+live+streaming+online+free+24%252F+7', suggest a lure to a website offering live streaming, likely a scam or phishing attempt. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?utm_term=wwe+network+live+streaming+online+free+24%252F+7
    • https://cdn-cms.f-static.net/uploads/4388272/normal_5fb9d0a2f2063.pdf
    • https://zevenilusowaj.weebly.com/uploads/1/3/4/3/134324486/kozakopif.pdf
    • https://cdn-cms.f-static.net/uploads/4422168/normal_5f98431df0951.pdf
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/xifaboxuf.pdf
    • https://cdn-cms.f-static.net/uploads/4382187/normal_5fa4bc84bc994.pdf
    • https://static.s123-cdn-static.com/uploads/4451230/normal_5fcf07c280302.pdf
    • https://cdn-cms.f-static.net/uploads/4500677/normal_5fbae40655554.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lakadutof/john_gba_pro_apk.pdf
    • https://s3.amazonaws.com/vatakefojunib/catastrophic_thinking.pdf
    • https://s3.amazonaws.com/zaxawetawupo/sogetesasaritenasasikawav.pdf
    • https://s3.amazonaws.com/jidosatikim/18436605000.pdf
    • https://s3.amazonaws.com/jipowumat/36512861337.pdf
    • https://s3.amazonaws.com/vokeri/oscar_awards_2019_in_telugu.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_off0000f35c.bin
7b6dc0e90b30330add6a177c62169572ceae787697687412285289137422129b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 5652 bytes
font_01_sfnt_off000106bb.bin
f51a17904375f5067a56fa4822ed95bb9dec272a5048e56aed27e51d8f5d8c40
pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 11532 bytes