Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a967bd05830179…

MALICIOUS

PDF

71.1 KB Created: 2021-01-14 11:10:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3efb1b732e6696d37b024fd250c0c983 SHA-1: d61430eede9f06fb50d677fafbee501d7b9eb937 SHA-256: f7a967bd0583017949e5f451a16054abae82df6735b37d26eb085ff6fe0def18
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body contains a message about an active directory domain controller issue, which is likely a pretext to direct the user to the external URL found in the PDF's metadata. This URL, 'https://traffnew.ru/123?utm_term=...', is a primary indicator of compromise, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=an+active+directory+domain+controller+for+the+domain+could+not+be+contacted+windows+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445325/normal_5faa48ca66b5f.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/4661e509545b7c1.pdfIn PDF document text
    • https://site-1177968.mozfiles.com/files/1177968/luzumanedipaneganadosafup.pdfIn PDF document text
    • https://site-1167986.mozfiles.com/files/1167986/42836271823.pdfIn PDF document text
    • https://juvirafiwak.weebly.com/uploads/1/3/4/3/134307718/83c08d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_5fb33c9c330ca.pdfIn PDF document text
    • https://site-1180366.mozfiles.com/files/1180366/send_files_to_tv_app_for_pc.pdfIn PDF document text
    • https://site-1166042.mozfiles.com/files/1166042/tanix_tx9_pro_user_manual.pdfIn PDF document text
    • https://site-1177330.mozfiles.com/files/1177330/friend_search_tool_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5f9c2d139c543.pdfIn PDF document text
    • https://site-1172367.mozfiles.com/files/1172367/ironman_70__3_waco_race_report.pdfIn PDF document text
    • https://site-1185731.mozfiles.com/files/1185731/futorinawigizi.pdfIn PDF document text
    • https://site-1177041.mozfiles.com/files/1177041/pemborong_kad_topup_murah.pdfIn PDF document text
    • https://site-1180124.mozfiles.com/files/1180124/describe_yourself_in_an_interview_answer.pdfIn PDF document text
    • https://site-1247225.mozfiles.com/files/1247225/baaghi_film_video_song_3gp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dixaleko/ceiling_fan_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/bosagizejexogogujex.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 5724 bytes
SHA-256: 832642f5ab5b4bb210fa26a32c5d349342618b5e3c1c296a823b32a143b49d20
font_01_sfnt_off0000e9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D7 10720 bytes
SHA-256: e8959a512e95233a095987070a287b423e018304e5722a773d0bb539d47abca5

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