Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec23352d7c078ac…

MALICIOUS

PDF

79.0 KB Created: 2021-03-22 21:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6cb1fdf55b93d0325967c3c6ef48969f SHA-1: 08a08d82ece3ca64386669ec4cd5bdcacce581a7 SHA-256: 7ec23352d7c078ac5f5ebf0e267848a2e1d7d44976f40285c9d9edb803b5dc4a
126 Risk Score

Malware Insights

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

The PDF document is classified as malicious by ML and ClamAV, and exhibits characteristics of a link farm with numerous embedded URLs pointing to disposable hosting. The document body, though heavily obfuscated, suggests a lure related to 'Biblical books in chronological order' to mask the malicious intent of directing users to potentially harmful websites.

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://golowaki.ru/strik?utm_term=biblical+books+in+chronological+order PDF link annotation
    • http://sifinujox.sportsontheweb.net/annihilation_of_caste_free.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/some_basic_theory_for_statistical_inference.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481291/normal_604b7047c47fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392668/normal_5fe54305a3115.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/1216588449.pdfIn PDF document text
    • https://gajatizu.weebly.com/uploads/1/3/5/3/135315297/bd0f050f37e93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_603160b77e511.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/sociological_theory_of_crime.pdfIn PDF document text
    • http://fezufizibum.mypressonline.com/calendario_escolar_2020_bolivia.pdfIn PDF document text
    • http://fisujerekuvij.getenjoyment.net/what_are_the_10_major_sins_in_islam.pdfIn PDF document text
    • https://fejiwapofiji.weebly.com/uploads/1/3/4/6/134699364/vurelaturi.pdfIn PDF document text
    • https://tudekazesabi.weebly.com/uploads/1/3/4/3/134367585/gipikanano.pdfIn PDF document text
    • http://delinapod.mypressonline.com/89027060126.pdfIn PDF document text
    • https://juzuxadubibipa.weebly.com/uploads/1/3/4/6/134685448/5334183.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcac2732-d322-4806-a3b7-84a70ab98f66/guitar_exercises_for_dummies.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/waterpik_cordless_advanced_water_flosser_wp-562.pdfIn PDF document text
    • http://kitilogokufalu.atwebpages.com/67577436928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/325c01b7-9b39-42e0-a970-30d85663b815/51956319042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65c743e-d8a2-41f8-8ff2-93b6cdc0b5fb/how_to_use_turtle_beach_x12_on_xbox_one.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/doxovamawamuve.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_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 5456 bytes
SHA-256: 208dd464735042f836dd3847f218dd677384779f64e035cc978f56c96474e682
font_01_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 10200 bytes
SHA-256: a800333141e4321c6c9f09b1d07cc5b91dfe6e19e2a148a85575237c24ffc086

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