Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c687f5eaf07126e…

MALICIOUS

PDF

85.0 KB Created: 2021-02-13 10:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d7c3e0bc3ff692f5fb66d799635ef8d4 SHA-1: 704f0e011ba4a051fb1a7f713483006ce58124c2 SHA-256: 9c687f5eaf07126edd86cff21980ae06c65f5d3b6b1948d2bb4a3718fb3090db
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a prominent one pointing to 'leonvi.ru', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=spider+man+web+games+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412591/normal_6023d51a16bd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476751/normal_5fdf8759cbbc1.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/ecNjfic/57919750748.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454301/normal_6002231918097.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/cosmote_4g_wifi_router_manualcuida.pdfIn PDF document text
    • http://verification-help.business/jibulat8y009.pdfIn PDF document text
    • http://starkrobotics.org/religious_education_questions0m1tr.pdfIn PDF document text
    • http://9gusevshop.space/creative_destruction_game_age_limit80iq6.pdfIn PDF document text
    • http://marketes.pro/nubiporubadusenijarasugxqr5u.pdfIn PDF document text
    • http://redpandarecycling.com/roller_hockey_teams_near_medc8z9.pdfIn PDF document text
    • http://gejobukopap.iblogger.org/ophthalmology_abbreviations.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bezopiwuzalobit.rf.gd/fimekuromuxotusukuke.pdfIn PDF document text
    • http://repuvamiperubo.epizy.com/website_to_get_free_chegg_answers.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000110e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x110E5 21312 bytes
SHA-256: cbf67c7d4d08f7fb65c81dacffef01a38bd7c8c7ddde4a53ecfb90bf525681bb
font_00_sfnt_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 5596 bytes
SHA-256: ef9741151f06c9ed1493a13b9d87df0ed90111de50ccb9f2ef07dd0318fec581
font_01_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 10052 bytes
SHA-256: 7042898a20ef781b74bde134607a400208cbecf9c7c5524dd40238f0701e14a4
font_03_sfnt_off0001366d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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