Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9943df4c3bd460…

MALICIOUS

PDF

68.2 KB Created: 2020-11-17 06:15:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 449a5173642625a1eeb8040b7fb976f7 SHA-1: 182dc9b7251b1feb1f04ba1975143848c97361f1 SHA-256: 7b9943df4c3bd460e488c5304f1a09eff7e50593083f0c633c8543647acc2a10
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection scheme. The primary URL, 'https://traffnew.ru/strik?utm_term=coraline+full+movie+free+download+fo', indicates a lure for movie downloads, a common phishing tactic. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=coraline+full+movie+free+download+fo
    • https://serabonileraso.weebly.com/uploads/1/3/4/4/134444783/d86baba78031ec9.pdf
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f98dfb6cc36f.pdf
    • https://cdn-cms.f-static.net/uploads/4486751/normal_5fac234f8d4d6.pdf
    • https://gimelukisisira.weebly.com/uploads/1/3/4/0/134040832/65b17d28e4e4d3b.pdf
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5f93ceed2e633.pdf
    • https://zexafufu.weebly.com/uploads/1/3/4/5/134510694/nokufajopez.pdf
    • https://remezimivof.weebly.com/uploads/1/3/4/5/134582621/nerodujobubulodop.pdf
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f8a51f9e8f26.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tibitexil/97356088820.pdf
    • https://s3.amazonaws.com/zerepuzuze/92690802836.pdf
    • https://s3.amazonaws.com/luramamelolem/luduboredotoj.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_off0000cf55.bin
e7ae69292471c90702775746ac6cbf3a017b44f7fceb8802d16395335e13c97b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 4932 bytes
font_01_sfnt_off0000e017.bin
82a71b6a519898f08acba5051eac03a33045d9f8806b62848ac1dcf32d2edad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 10656 bytes

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