Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f57fd681bb31d9…

MALICIOUS

PDF

86.3 KB Created: 2021-04-22 17:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 91141860fcbc8af0a90a4908093f5fc2 SHA-1: 78b945f389d96dc9553dbc9ea9e1b9f56e72172d SHA-256: a3f57fd681bb31d9e35e4011317182800eafbf4b8a57076860486ea332ec0599
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicate a malicious intent.

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://seumenha.ru/strik?utm_term=can+you+lose+weight+with+p90x3 PDF link annotation
    • http://com-connexion.xyz/where_is_the_motorola_droid_sim_cardtkit8.pdfIn PDF document text
    • http://meetlait.pro/bedevilled_movie_freesgrn3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411500/normal_5fff9bbfa75b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366632/normal_60038981d50c9.pdfIn PDF document text
    • http://handler-autoscout24.com/robert_lafore_data_structures_and_algorithms_in_java_pearson_publicationsaw6s.pdfIn PDF document text
    • http://modernstyle.pro/shadowrun_rpg_release_datec7wai.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/solving_linear_equations_with_variables_on_both_sides_worksheet_with_answer_keyn46ko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385422/normal_6006ba6ea9602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_6016b73b1097a.pdfIn PDF document text
    • http://outputqwvk.space/32255882333mpeo5.pdfIn PDF document text
    • http://pollsexpert.com/ps4_racing_games_that_use_steering_wheeli2c0l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499351/normal_603c3f9c6a6ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448331/normal_606ca12361ffe.pdfIn PDF document text
    • http://giocodigital.website/audio_video_editor_free2ga47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454819/normal_602a256853a9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_97f3cc52ded048a7900af78a4753c4fb.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_28bfc8fb5b9a4eb7b02fa79c28af7bde.pdf?index=trueIn 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_off000110d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 5612 bytes
SHA-256: 7fafe499a7e1fa4f7f84c846e59753a86e91e507f5b24ba9aef7180242dfabf9
font_01_sfnt_off0001240a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240A 12096 bytes
SHA-256: 488ab4eda1fe4f4b7cdc290980cf8415a1b9f61d0c75d9e375ac19cdd16555ca

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