Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5b073e509fd438…

MALICIOUS

PDF

117.9 KB Created: 2021-03-14 12:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7924b7a2328261048840631f93aeea95 SHA-1: 28319f5a9df2fbb2b0bfe20feca99ad2cecd7c37 SHA-256: 7a5b073e509fd438b40beb32911414c7b32bacaf56ecdf0e4145c10c79610f1c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'midufefew.ru', which is also identified as a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to 'Bible quiz questions'. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=bible+quiz+questions+and+answers+from+the+book+of+luke+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411273/normal_603a987dc3f42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_602c37ca86c26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455901/normal_6026296766307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372721/normal_5ff7eb54984be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_604124317663b.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/alternating_current_notes_class_12.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/baixar_fonte_the_vampire_diaries.pdfIn PDF document text
    • http://wifisef.medianewsonline.com/60058990053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5fd1b986ca356.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/waduzirader/research_timeline_template_word.pdfIn PDF document text
    • http://xiwozoget.atwebpages.com/50917615341.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/black_block_heel_platform_ankle_boots.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/91173941652.pdfIn PDF document text
    • http://taguloxutenafol.myartsonline.com/77739466529.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/mw3_cheats_xbox_one.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/jovisonitix.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/metric_conversions_worksheet_1.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/bcom_1st_year_question_papers_2016.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_off000191b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191B9 5804 bytes
SHA-256: 8b4b3195d20a9b329cbdded456b703f2e5113662c98191a80b7598fb7f68a5f2
font_01_sfnt_off0001a565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A565 10728 bytes
SHA-256: 6919c902aa894dbedb979ba3ff2401c4a1fa7db3e0542678b53c4d9111836c16

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