Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0eaacbfa35015a…

MALICIOUS

PDF

89.9 KB Created: 2021-03-12 01:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 648668d413b7cb07c2ef40ab4a8e63b2 SHA-1: 5aabe210adfcb08dcf732e468db53e3835c1b892 SHA-256: fe0eaacbfa35015af9a14dd9b29651a66c2351254105aef0cf17d9fd7f12c6be
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure and a link farm. It contains numerous external links, with a primary suspicious URL pointing to 'pelibifir.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic to bypass security scanners by instructing the user to open a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pelibifir.ru/wix?keyword=la+casa+de+los+espiritus
    • https://wesuzijuto.weebly.com/uploads/1/3/0/7/130740493/25fdaf18d333fc8.pdf
    • https://cdn-cms.f-static.net/uploads/4383149/normal_603683d3917b9.pdf
    • https://static.s123-cdn-static.com/uploads/4416140/normal_60099e6b9f518.pdf
    • http://kigurumi.org/salvation_army_employment_application_forml5q81.pdf
    • https://tibagikusutugox.weebly.com/uploads/1/3/0/7/130775046/3361288.pdf
    • https://cdn-cms.f-static.net/uploads/4382793/normal_604a9dda25452.pdf
    • https://sekowuwumobof.weebly.com/uploads/1/3/5/3/135394032/lekurazag_vefez_fapowixira.pdf
    • https://dofopukirisozut.weebly.com/uploads/1/3/1/4/131437491/b7e936b2.pdf
    • http://5coupons.info/is_iphone_4_camera_goods350y.pdf
    • https://jilolepileg.weebly.com/uploads/1/3/1/4/131453494/a3c620d.pdf
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/sufijinivigari_pudigo_gosodiv_defizisokemif.pdf
    • http://circleshtang.xyz/digimon_world_3_training_gym_guidermme2.pdf
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/22e4db83a1.pdf
    • https://cdn-cms.f-static.net/uploads/4472764/normal_602d4c6d92eba.pdf
    • http://smartradiobf.ru/dyson_big_ball_animal_vacuum_cleanerhc92e.pdf
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/kiwezapikuposo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vudivuzakal/59352976933.pdf
    • https://s3.amazonaws.com/tadevewuju/the_chess_players_full_movie.pdf
    • https://s3.amazonaws.com/gudukupir/gedefevigudaxerovi.pdf
    • https://s3.amazonaws.com/lemerisinivum/car_pictures_for_desktop_background_free.pdf
    • https://s3.amazonaws.com/fovezewi/what_does_the_long_run_cost_curve_mean.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_off0001225b.bin
5f33c7fa41db92d6889486b72218296c3e15de972c97bb18bbff80187af372c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 5008 bytes
font_01_sfnt_off00013371.bin
f9cb0fe106f80e6fb49dd30d3a9f102ae18b2fdb13b65472b6bd045af0a7bbd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13371 11508 bytes

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