Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc73d015f52d2ba…

MALICIOUS

PDF

139.5 KB Created: 2021-04-13 18:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a18af70c58aa3a4de48e8ef5b226b2f1 SHA-1: b71b327e9310f0f24006eb42449d20e67b783c62 SHA-256: dfc73d015f52d2bac68058b09cd717e9130d9d5b5f3be89ededae2a8a5940afe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it functions as a link farm for SEO manipulation or to direct users to malicious content. The primary malicious URL identified is https://seumenha.ru/strik?utm_term=the+challenge+inferno+3+where+to+watch.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=the+challenge+inferno+3+where+to+watch
    • http://ramosek.iblogger.org/govume.pdf
    • http://tesopinafap.22web.org/butusoxezajedafegu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://92fbd7ca-8480-4723-bb2c-19523f9dca15.filesusr.com/ugd/29946e_7e5362b2d4ec46d9ba038e17c45c23e2.pdf?index=true
    • http://xitevesapa.epizy.com/spongebob_squarepants_theme_song_clarinet_sheet_music.pdf
    • https://s3.amazonaws.com/tarajix/28762385168.pdf
    • https://s3.amazonaws.com/turip/free_engagement_invitation_templates_word.pdf
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_e38e2246c734400b93bd4f6afa89e9bd.pdf?index=true
    • https://s3.amazonaws.com/taturi/demonstrative_pronouns_worksheet_for_grade_1.pdf
    • https://s3.amazonaws.com/gizonukorad/kililodazafobebakufupaza.pdf
    • https://s3.amazonaws.com/dobesogum/feregewekawuxelijulezut.pdf
    • https://s3.amazonaws.com/kubedukowug/gowan.pdf
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_e51c8ee813d249c88c45ab24dd8f765f.pdf?index=true
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_c3aa0782662c46e7975c4ae032d370e8.pdf?index=true
    • https://s3.amazonaws.com/sumesawoxajew/dagukezazu.pdf
    • http://lovenewaw.rf.gd/bihar_board_12th_physics_question_paper_2020.pdf
    • https://s3.amazonaws.com/patilawasu/49557129720.pdf
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_18b8da1b9a1849bdadc0b1328c0465fd.pdf?index=true
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_94d570136fec40b9b2949d767b3a1419.pdf?index=true
    • https://s3.amazonaws.com/simujix/what_is_agile_methodology_process.pdf
    • 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_off0001e4d7.bin
48c8129ffcaf1e48ac53c516d1e09c07a9975ea7fff09dc8881e2a52c13e1d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4D7 5168 bytes
font_01_sfnt_off0001f682.bin
dfc201fb987217add3d009df73e03466be5c8900da16fe4b7b12dae270c4292d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F682 11920 bytes

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