Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c40a36ed407cd2…

MALICIOUS

PDF

68.7 KB Created: 2021-01-17 05:44:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c69afe7d0c0040ba1d7efbfa292201dc SHA-1: 9f9733d4bf6e08a4d53bb91e9afbb2ee78674903 SHA-256: d6c40a36ed407cd2b12e005374f01e4723714d523402d2fc8d2c0c0fd53b3e0d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf. The primary attack pattern involves directing users to numerous external URLs, likely for malicious purposes such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffset.ru/123?utm_term=lake+mary+utah+temperature PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493201/normal_5fff726a97eaa.pdfIn PDF document text
    • https://cdn.sqhk.co/xejulonejo/VmVihb5/mobile_auto_electrician_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/OIijyvL/allegiant_air_flight_status_punta_gorda.pdfIn PDF document text
    • https://site-1172175.mozfiles.com/files/1172175/favicon_in_css_stylesheet.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/giIhbTb/99796274945.pdfIn PDF document text
    • https://site-1166670.mozfiles.com/files/1166670/dodizapozudipe.pdfIn PDF document text
    • https://cdn.sqhk.co/wirujurumugi/kTZibje/arcade_machine_repairs_melbourne.pdfIn PDF document text
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/bd7f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388815/normal_60025794cb42d.pdfIn PDF document text
    • https://site-1171718.mozfiles.com/files/1171718/46846904603.pdfIn PDF document text
    • https://site-1166687.mozfiles.com/files/1166687/comedian_bio_template.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/digjiaD/pinball_fx3_sorcerer_s_lair_skill_shot.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/QgckhfZ/62924707859.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/hfhdPhc/juegos_retrocompatibles_con_xbox_360.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD215 4956 bytes
SHA-256: 63faeb59153981261053aa076987aa890e60c36225bebd29af56daf52b16b6c1
font_01_sfnt_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 10408 bytes
SHA-256: 4c0e68bc70fca78b6cd6e3f5fa36001b046892c3588ec1566afdeeeb66f654ba

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