Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f483c13f4173603…

MALICIOUS

PDF

90.3 KB Created: 2021-03-15 01:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25bfecefc00e0891b83392db31bc91a1 SHA-1: eb17a2e1f5c0104315c1dc94764c5158aa3fd688 SHA-256: 3f483c13f4173603b3e9b50d6214c0e130a5afaf23d43adcdae54e9ade223ec5
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits multiple indicators of malicious activity, including a high ML classifier score and ClamAV detection as a phishing trojan. It contains a large farm of external links, with one prominent URL pointing to a suspicious domain. The document also includes lures for MFA harvesting and callback phishing, suggesting an attempt to deceive users into revealing sensitive information or engaging with fraudulent services. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://midufefew.ru/wix?keyword=gears+tv+download+on+computer
    • http://punejew.mygamesonline.org/what_is_16_personality_test.pdf
    • https://cdn.sqhk.co/dudugetogi/eQiigeI/36879655272.pdf
    • https://static.s123-cdn-static.com/uploads/4367297/normal_5fcdd07104e7d.pdf
    • https://cdn.sqhk.co/segevenujuka/ehiIiaX/football_training_programme_6_week.pdf
    • https://static.s123-cdn-static.com/uploads/4418001/normal_60088091afabc.pdf
    • https://cdn.sqhk.co/dulinifijal/jhorEid/marshall_american_football_movie.pdf
    • https://static.s123-cdn-static.com/uploads/4476766/normal_6008a18924189.pdf
    • http://sitizinudex.getenjoyment.net/48675157021.pdf
    • http://tadugebakonuged.getenjoyment.net/872649359.pdf
    • https://cdn.sqhk.co/zapevexuvot/0Fiegiu/19421107399.pdf
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/4241624.pdf
    • http://kojijeku.mygamesonline.org/formula_de_disolucion_molaridad.pdf
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/zowup.pdf
    • https://luxaxila.weebly.com/uploads/1/3/0/8/130814132/4911380.pdf
    • https://cdn.sqhk.co/xonoguduzob/fo1jhgj/taylor_swift_women_s_soccer_team.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c1fd54da-263f-44f2-8c3e-3f85be8497c2/roles_and_functions_of_social_workers_ppt.pdf
    • https://uploads.strikinglycdn.com/files/d5451a20-7026-4ab8-bad3-d9deee38fd72/vefuboxevazilor.pdf
    • https://uploads.strikinglycdn.com/files/903198aa-cf35-4a3a-b8ea-5e7600051c03/meade_etx-70at_accessories.pdf
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_eeaf4e27f7a74b4b818cb56d8608f9d9.pdf?index=true
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_c3fb53fcfa79460b98fe49434af4070d.pdf?index=true
    • 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_off0001204d.bin
491ae0ee6a8c506f3252e61fd743349353fff4e5c8f81cdd94b380d07914c971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 5404 bytes
font_01_sfnt_off000132b0.bin
40c930933c7fd78ca0ed8b3daab472a87fb4db90124e8a5c16a123658503233e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 12296 bytes

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