Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5727d9b32c3848e…

MALICIOUS

PDF

69.4 KB Created: 2020-12-04 14:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6ed82945f01ea03e5819725a58191356 SHA-1: 8e741bfeb814ef94c52796eb53cf095cea6b3fbe SHA-256: a5727d9b32c3848ee4656876b5cc7141873ba649bf05e94f92d894ce96318907
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's purpose is to trick the user into installing a malicious browser extension or update. The presence of numerous external links, including one pointing to 'trafficel.ru', further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/aws?utm_term=create++button+in+html5 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453105/normal_5fb25d5a6f46b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5fb6414fa22e7.pdfIn PDF document text
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/1571193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5fb388d88bfa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f8887d5898f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_5fc0558a7ba75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bulujono/tolisesefavaf.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/jurnal_adversity_quotient.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/namenawam.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc531f011f6a41984a1bae2/t/5fc988694e3f3d2517332d95/1607043178000/sling_bag_with_water_bottle_holder.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/52509804011.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B8 4916 bytes
SHA-256: 8e4c606a6078e056b2f15da96aab3531992fc02da59fb9fc2ee096755f3ed545
font_01_sfnt_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 10788 bytes
SHA-256: a4f757498a858e3bf07eab634827ce4799e5476350ddc6494ff27c49600cab9d
font_02_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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