Malicious PDF — malware analysis report

Static analysis result for SHA-256 10876aa34dd040de…

MALICIOUS

PDF

66.1 KB Created: 2020-12-14 23:25:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef3cb65a65330d2ea96fe2bcac726622 SHA-1: 7826e45490b01d27015d40e9733b3321f8fdc2f3 SHA-256: 10876aa34dd040decc85a4ea8c08f5f368c9687e7fbee64c75137c8a16189b77
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one to 'trafftec.ru' and another to a Weebly hosted PDF, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites.

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://trafftec.ru/123?utm_term=module+6+quiz+answers+everfi
    • https://setinedib.weebly.com/uploads/1/3/4/6/134684411/1430873.pdf
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5f88f7c5dbd43.pdf
    • https://xipezote.weebly.com/uploads/1/3/4/8/134882979/46831af0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc32a51cd1e280355e2ea57/t/5fc62bc92dd96f5918bf6114/1606822858746/portable_speakers_with_chromecast_built_in.pdf
    • https://static1.squarespace.com/static/5fc16c877848ba205d1c3861/t/5fc5db13bc819f1cf4a39648/1606802195520/wudomujowozaferebirid.pdf
    • https://uploads.strikinglycdn.com/files/27fa501b-aaf2-40a7-9201-5d3aeebead5b/generate_xsd_from_xml_visual_studio_command_prompt.pdf
    • https://static1.squarespace.com/static/5fc5904aff13940aa25f39a7/t/5fcd4bf424c49707d32e4fd0/1607289844625/xumegujuke.pdf
    • https://static1.squarespace.com/static/5fcec30ede407d5e35c9fb49/t/5fd66322ffab5d3c56fa5856/1607885607318/btech_malayalam_movie_all_songs.pdf
    • https://uploads.strikinglycdn.com/files/e70bd507-4f1c-44ac-864c-e5ce6e02cb67/vuxidibi.pdf
    • https://static1.squarespace.com/static/5fcec30ede407d5e35c9fb49/t/5fd662e05b1f6f7539d725cf/1607885540654/671254695.pdf
    • https://uploads.strikinglycdn.com/files/001ac928-6538-45a4-b9e6-d8ca2f8b2210/2002_chevy_camaro_z28_manual_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/362563df-53a3-429d-a2c1-d70787476375/helix_cda_s01e02.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_off0000c5ea.bin
25c49b090f6a19835285e7d6fd28958cf179ab05afeb55b0b311c9384d82b338		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EA 5388 bytes
font_01_sfnt_off0000d875.bin
dfcf1a8c4e87ea8b67a518db41fade7ec93fe1faca5419c61a6a0ab0b89280b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 10544 bytes

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