Malicious PDF — malware analysis report

Static analysis result for SHA-256 83900fc648e2c02c…

MALICIOUS

PDF

81.2 KB Created: 2021-01-16 14:30:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 097dd4c35ed0e475435b7eee320b6102 SHA-1: d48aea69727e1172cf90d012b45ed55759398510 SHA-256: 83900fc648e2c02cd2ee09b32abbe28142fe635e7e02e818cbbcc363cd5fe2fc
134 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_URGENCY_LURE' suggests the document attempts to create a false sense of urgency to prompt user interaction. The presence of external URIs and a link farm pattern indicates a likely attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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
  • 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://traffine.ru/aws?utm_term=armored+core+for+answer+canon+ending
    • https://cdn-cms.f-static.net/uploads/4374956/normal_5f95ba4d89089.pdf
    • https://static.s123-cdn-static.com/uploads/4385421/normal_5ffb04ec073e2.pdf
    • https://site-1178617.mozfiles.com/files/1178617/a__p__a_format_for_references.pdf
    • https://cdn-cms.f-static.net/uploads/4472185/normal_5fbe75c6e6e38.pdf
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5fc02702caa08.pdf
    • https://site-1176887.mozfiles.com/files/1176887/72177961459.pdf
    • https://site-1173985.mozfiles.com/files/1173985/97223825622.pdf
    • https://site-1243844.mozfiles.com/files/1243844/actor_ajith_songs_free.pdf
    • https://cdn.sqhk.co/seponidozit/agfjdvR/zombie_apocalypse_game_unblocked_6969.pdf
    • https://cdn-cms.f-static.net/uploads/4505363/normal_5fc0a76e641e6.pdf
    • https://site-1168056.mozfiles.com/files/1168056/video_maker_app_for_pc_windows_8.pdf
    • https://cdn-cms.f-static.net/uploads/4368781/normal_5f9ec3ca8d1d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wulagisi/ximeramajinawisutu.pdf
    • https://s3.amazonaws.com/pobixedele/67176188927.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_off00010124.bin
d41f8d764e0eb85b8f247b91364dccf016627125d2966d956836e63852b31ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 5388 bytes
font_01_sfnt_off00011373.bin
a2fd5909b06b34ed042231e5add543fa33229435f9ad1834de91dab5c1b1d39b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 10708 bytes

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