Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb576c9faece793f…

MALICIOUS

PDF

69.2 KB Created: 2020-12-31 19:40:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48f6e8f1ceb55df966cbce3f2b5546c7 SHA-1: e826462ec1d109190119feb86fdf8e3ce761fd86 SHA-256: cb576c9faece793fb525272f31d40cf95cdbda54254c915b3917b64148fdb9c3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, with one pointing to a suspicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://trafficel.ru/strik?utm_term=loopback+adapter+windows+10
    • https://cdn-cms.f-static.net/uploads/4446394/normal_5fd30c4ca915b.pdf
    • https://cdn.sqhk.co/bepemuno/ghNjaih/73605571480.pdf
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/rejaxi_kedibetojipite.pdf
    • https://cdn-cms.f-static.net/uploads/4450426/normal_5fbb96c7d88f1.pdf
    • https://xixafaxuxux.weebly.com/uploads/1/3/4/3/134340403/jelubarujutidepefori.pdf
    • https://cdn-cms.f-static.net/uploads/4423431/normal_5fb42c5a572e3.pdf
    • https://cdn.sqhk.co/golizojuw/FyFhdMJ/xixaxasure.pdf
    • https://static.s123-cdn-static.com/uploads/4454304/normal_5fcc73a7beffe.pdf
    • https://cdn-cms.f-static.net/uploads/4389571/normal_5f93c919daa94.pdf
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f8f31166e9af.pdf
    • https://cdn-cms.f-static.net/uploads/4498376/normal_5fbe0c3de3559.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/656da173-b8e8-47eb-a7ea-80446a4a1bce/66049881055.pdf
    • https://uploads.strikinglycdn.com/files/a00d685e-d941-425a-b4f5-3276ac29fe9c/42932263386.pdf
    • https://s3.amazonaws.com/gaxuremewuger/98593455684.pdf
    • https://uploads.strikinglycdn.com/files/2a0cee9a-6a41-4741-86f3-5c1d1e901f91/39751526202.pdf
    • https://uploads.strikinglycdn.com/files/da261b6e-e4f0-4807-8ffa-cc4472db0120/cheat_codes_for_elvenar.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_off0000cf7d.bin
4169ffc9d7b4e2a241ffbaccd1017cdfcc13d72e927ce0dce3c192c51d8de2bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 5464 bytes
font_01_sfnt_off0000e233.bin
9e2571441ef9a58257def657b096cae69159219ad95e6a9234b7dd854698f72e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE233 11780 bytes