Malicious PDF — malware analysis report

Static analysis result for SHA-256 9742c68d1502197b…

MALICIOUS

PDF

81.2 KB Created: 2021-03-08 08:00:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 36a48ad9712fa5df3b2dad533a5c56fc SHA-1: 17f9943fffa1f0f415e68689f357ca7c3a5237d6 SHA-256: 9742c68d1502197b7e3b9e1f529254b1008a0fd8e49d68c529c38f753cb97881
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, disguised as a review, which is a common tactic for phishing and malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is part of a link farm designed to drive traffic to potentially malicious sites.

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 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://midufefew.ru/strik?utm_term=diary+of+a+wimpy+kid+long+haul+review PDF link annotation
    • https://cdn.sqhk.co/kuvuzebilet/emBTtMk/monster_hunter_world_iceborne.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/3haQkj0/ice_hockey_game_rules_and_regulations.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/padenegor.pdfIn PDF document text
    • http://wgathering.org/lotafopozikopegajironiqxr8i.pdfIn PDF document text
    • http://draiwenstore.online/lexesewiduzulykk4u.pdfIn PDF document text
    • http://leyloften.online/40220375581z8jxv.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/lezidapite.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/paverefevid_tikuxosowamu_xalazitipevo.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/40373949432.pdfIn PDF document text
    • https://dilasakezonaxos.weebly.com/uploads/1/3/0/7/130775260/2444291.pdfIn PDF document text
    • https://cdn.sqhk.co/sisuriwul/ahjjaje/offline_chess_free_download_for_windows_7.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/zerepuzuze/writing_equations_of_parallel_and_perpendicular_lines_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/fitafapat.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/singer_heavy_duty_sewing_machine_4432_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/zirupuvudobuwebowex.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/4516431090.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/saninefexubafurexodi.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/yoga_workout_for_lower_back_pain.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 5592 bytes
SHA-256: 7ac0418d31c773cde79357bbf1bb798de1cdc19960fd25cb0c3a1dba17745313
font_01_sfnt_off0000fbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 10848 bytes
SHA-256: 1d5065f5cc2f51b69863a29584f21bdbf2bad736729a86d1008c6e03c6c8ae4e
font_02_sfnt_off00012137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 16448 bytes
SHA-256: 1e46d1352e8719eb34233d6c1ca219fe006b4d070615e762ea3f88a5582ee117

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