Malicious PDF — malware analysis report

Static analysis result for SHA-256 562e79db62c41e9b…

MALICIOUS

PDF

74.2 KB Created: 2020-12-26 11:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 757bdc024b4c6a0b2347db62abec3768 SHA-1: 5db22122d140cbbccd1d585e82919514fa62c4e9 SHA-256: 562e79db62c41e9b7f50af2bceff387e85f9f5ba26d451fad678c7b54500e82a
172 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the presence of external URIs, a link farm, and urgency/download button lures, suggesting a phishing or malicious download attempt. The primary external URI, https://trafftec.ru/strik?utm_term=video+tv+cast+chromecast+apk+premium, is likely the intended destination for the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/strik?utm_term=video+tv+cast+chromecast+apk+premium
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5f95893493aa7.pdf
    • https://cdn-cms.f-static.net/uploads/4388174/normal_5fb972d73bb63.pdf
    • https://cdn-cms.f-static.net/uploads/4463803/normal_5fb2d56fd4bf3.pdf
    • https://static.s123-cdn-static.com/uploads/4451574/normal_5fcd41f48075b.pdf
    • https://static.s123-cdn-static.com/uploads/4408172/normal_5fc66b914303d.pdf
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f93c0fcb4e70.pdf
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5fa8d17626ff6.pdf
    • https://cdn-cms.f-static.net/uploads/4404112/normal_5fa62f9b81c24.pdf
    • https://cdn-cms.f-static.net/uploads/4406229/normal_5fb6ad170fa26.pdf
    • https://cdn.sqhk.co/tesikotuk/ihhdijS/17873511285.pdf
    • https://cdn-cms.f-static.net/uploads/4459027/normal_5fbecf1c15471.pdf
    • https://fekanarikivokil.weebly.com/uploads/1/3/4/8/134884633/sipije_zigewefavonizob_kozewarufe_pudufinuxiw.pdf
    • https://cdn.sqhk.co/momujolo/ORmgcXX/tukigilegidikumaxanudi.pdf
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/gexug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pisik/5072644773.pdf
    • https://s3.amazonaws.com/zedudo/abbyy_finereader_corporate_12.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_off0000e269.bin
0fe1503c861ffa9da6eccf111db41c6415231921e5ac302bad31411cbd18c127		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 5372 bytes
font_01_sfnt_off0000f48a.bin
ffe8e0b9e8c1cf42466bcd968a945e86634f69efd2be34822683ea807b45ae57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 11552 bytes

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