Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dc86ecca5263fe…

MALICIOUS

PDF

77.9 KB Created: 2021-02-23 21:34:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d5b7c36066def0f2ef1706799a684431 SHA-1: a8004e1048e5bcc5aa9ed6bc0cde2b8d31bcda62 SHA-256: 97dc86ecca5263fec13676d7ec37799101b4280f75706f031df5f1b0046a951a
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically leading to a suspicious domain 'baarspo.ru' that is likely part of a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a popular anime character, aiming to trick users into visiting the malicious URL.

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://baarspo.ru/strik?utm_term=who+is+the+most+popular+death+note+character PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446374/normal_6028990b50cdd.pdfIn PDF document text
    • https://sopaxibifezubin.weebly.com/uploads/1/3/4/6/134608036/pirenajopupu_wazigomiwefiw_furabibafujoril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465705/normal_5fd8eb637e45f.pdfIn PDF document text
    • http://creditinquiry.info/51370124440bcng.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369782/normal_5fdde27ae2b63.pdfIn PDF document text
    • http://spiritstudio.ru/honeymoon_cystitis_adalahzj2p8.pdfIn PDF document text
    • https://dominisu.weebly.com/uploads/1/3/1/3/131379959/4711289.pdfIn PDF document text
    • https://nalovitifa.weebly.com/uploads/1/3/4/6/134600698/pimegoxo_rexor_kixolu_favubobopod.pdfIn PDF document text
    • http://dobomasinuraz.iblogger.org/27761611164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454575/normal_5fcd1001c9348.pdfIn PDF document text
    • http://urott-hu.com/sql_interview_questions_and_answers_for_freshers_free_downloadnmact.pdfIn PDF document text
    • http://stopnutristrike.ru/gavil8c7p1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xitutudatiri.epizy.com/receipt_template_photoshop.pdfIn PDF document text
    • http://temitugefowe.epizy.com/game_alien_shooter_1_2.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/video_blackpink_boombayah_live.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/cevital_bejaia.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/bipatelavadugoku.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/rufavevanoz.pdfIn PDF document text
    • http://vubixegigag.rf.gd/fafex.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_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 5324 bytes
SHA-256: 9dc105add8123a095d2942ca0261e633d7ead7415272134b83264b965f7666a5
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 10540 bytes
SHA-256: 79088d92df0303a1de0c7b6d4b2322af4b31516010d7d1f1d9d94013d5e5824e

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