Malicious PDF — malware analysis report

Static analysis result for SHA-256 388a71cabd5d80c1…

MALICIOUS

PDF

75.6 KB Created: 2021-03-02 19:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b9bee6e9237936d6d69df73dbc7c1508 SHA-1: d2751f0ed2f168457684c00fb59763e54275b0f9 SHA-256: 388a71cabd5d80c1028c402e5463ad2c674566bf3c3f3d565eb6b5c453de23d5
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 phishing or trojan threat. It contains an embedded URI pointing to 'pelibifir.ru', which is likely part of a phishing campaign. The document body, though heavily obfuscated, suggests a lure related to an 'Epson gt-s50 service manual pdf'. The presence of external URIs and the ML classification strongly suggest an attempt to redirect the user to a malicious site.

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://pelibifir.ru/strik?utm_term=epson+gt-s50+service+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367000/normal_60038c0347c14.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/honda_civic_hybrid_repair_costs.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/when_oracle_12c_release_date.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/5807847619.pdfIn PDF document text
    • http://alcozerox.com/poxadanuralu8prvr.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/totifubagojoxotonozanux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451368/normal_5ffd5439a8f93.pdfIn PDF document text
    • http://okstore.info/what_do_you_mean_by_information_technology_industryluj65.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/hcvKAhV/ninja_run_game_download_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_602797b148248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mokixetat/zogajov.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/matejavimumab.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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 5792 bytes
SHA-256: b4451235e378aad14777d0dd1bf021ecb6cdedceb3732200496a98146c3974e3
font_01_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 10544 bytes
SHA-256: e02f64fb213a84141bcc0694cea88b5113869ef9c4091a2e0b50cdcbbc674424

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