Malicious PDF — malware analysis report

Static analysis result for SHA-256 af17c29f33a31826…

MALICIOUS

PDF

65.2 KB Created: 2020-11-24 05:45:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b91cc44c1298544e8bf3e23f9b70edb9 SHA-1: d3815a87e984e767a3e87edc86062f612f994a33 SHA-256: af17c29f33a318261755d300f7cfe70baa61a418017e87e76eed9bb4beb7ef92
214 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, forming a link farm, with one URL identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves redirecting users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/strik?utm_term=tapuscrit+l%2527+oeil+du+loup+cycle+3
    • https://fetozoweriwoj.weebly.com/uploads/1/3/4/6/134631739/sigelosuruxofonol.pdf
    • https://cdn-cms.f-static.net/uploads/4500674/normal_5fbc73a96174c.pdf
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f9870d862d2c.pdf
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5f96155052ff2.pdf
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/342553.pdf
    • https://mukozuzaze.weebly.com/uploads/1/3/4/2/134265885/gulofokewusilisir.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/xojajuv-mitegejitokuxig.pdf
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/f1566ba9.pdf
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f8d9cd39199e.pdf
    • https://kakijukiwobak.weebly.com/uploads/1/3/4/3/134322026/933435.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/leguvefu/fusionner_gratuit_illimit.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a962.bin
eb31b48e09ebd27c334f889f07331a2dce0696a8f9aaece83ea9a057987f4a62
pdf-font-stream PDF embedded font (sfnt) at offset 0xA962 5316 bytes
font_01_sfnt_off0000bb97.bin
e23698fd2243d9d4fc07cab1bbeda0f31cd121d22db3e92febb245570eb1d62b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB97 11736 bytes
font_02_sfnt_off0000e106.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 16204 bytes