Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc28062dfe38078…

MALICIOUS

PDF

71.3 KB Created: 2021-01-13 15:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bc561d887ca33e997461af48df2caf5 SHA-1: d7d943ad4e99a09c6d1fc361c8af2fae5d5366f4 SHA-256: 2fc28062dfe3807826e637950a4eb02ba2cbf6f97abe9efd83ced65fa6dbe3a6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous external links, suggesting a link farm or phishing attempt, with one prominent URL being https://trafficel.ru/123?utm_term=dragon+rider+cornelia+funke+pdf. The presence of embedded URLs and the overall structure strongly suggest this PDF is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=dragon+rider+cornelia+funke+pdf
    • https://cdn-cms.f-static.net/uploads/4428341/normal_5fa245c3d7af1.pdf
    • https://cdn-cms.f-static.net/uploads/4426550/normal_5fbc1de992343.pdf
    • https://site-1211292.mozfiles.com/files/1211292/mapfactor_navigator_gps_navigation_maps.pdf
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/4432628.pdf
    • https://site-1175420.mozfiles.com/files/1175420/credit_report_transunion_equifax_experian.pdf
    • https://cdn-cms.f-static.net/uploads/4417670/normal_5fbf64fa3f4fc.pdf
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/jurobipewok.pdf
    • https://cdn-cms.f-static.net/uploads/4417423/normal_5fa68741cbe66.pdf
    • https://cdn-cms.f-static.net/uploads/4417023/normal_5f95c0bbda994.pdf
    • https://cdn-cms.f-static.net/uploads/4470696/normal_5fda654cede00.pdf
    • https://site-1176376.mozfiles.com/files/1176376/cross_linking_procedure_recovery_time.pdf
    • https://site-1166617.mozfiles.com/files/1166617/69158776767.pdf
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f89a3bc80b3e.pdf
    • https://cdn-cms.f-static.net/uploads/4410962/normal_5fbd48db4dfa4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wusigipufuvowix/raid_air_basketball_game.pdf
    • https://s3.amazonaws.com/pizexopenaxu/ritepo.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_off0000db45.bin
07a1c0f75440e555baaaca52009c6869c64177c4dd3b74325dd91931432570b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 5208 bytes
font_01_sfnt_off0000ed1c.bin
cd06586f66ccbd099ece0b34279c0b6f212f5bd00a7b3d944d0887ec7e143f0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 10324 bytes