Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7011618be959d5c…

MALICIOUS

PDF

74.9 KB Created: 2021-04-02 22:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 9eb14ac86457ab9fb25396c209f2ecf0 SHA-1: a6d3d0ef9424a2026f44754fb36a7231a9996ee1 SHA-256: b7011618be959d5cd5aa849347ba006a28ebba657d7ca1129fc8b1b9ebf044be
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a suspicious domain, identified as a phishing lure. Heuristics indicate the PDF is part of a link farm on disposable hosting, and ML classifiers and ClamAV strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords related to the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=yard+machines+snowblower+oil PDF link annotation
    • https://cdn.sqhk.co/fogunedevare/jfgicMQ/zefufelupibesagazomevo.pdfIn PDF document text
    • http://robertferrell.net/kablo_kesiti_hesaplama_formC3BClC3BCvgfbi.pdfIn PDF document text
    • http://instapodarok.site/privilege_power_and_difference_2nd_edition6po7y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367911/normal_5fe4d294b42db.pdfIn PDF document text
    • https://cdn.sqhk.co/gipirukanut/K5hgjfK/nextbike_app_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484997/normal_5fcc1e6d55dd6.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/aYN8Ehh/crashing_renewed_season_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408582/normal_6019c1be9c04e.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/wazorixekunafob/businessman_3_oopiri_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48113069-caae-4d37-8475-9ab1986bcbd2/gamijukox.pdfIn PDF document text
    • http://rowodebifofida.rf.gd/org._bouncycastle._cms_jar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d1bb94-9630-48f8-aefa-7d12b237fd12/35229246966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/936e0cbb-3f32-4f28-9bfd-d57c184549d2/15790518155.pdfIn PDF document text
    • http://kiwozoma.epizy.com/gubosejatiripoliburi.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/pisikapelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52a9066b-28a2-404c-adde-1b5eaa8e72eb/50386827430.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/sijixexesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fae42d8-9f91-490a-8d24-e41e61b70300/ifly_carry_on_luggage_walmart.pdfIn PDF document text
    • http://pifujisebakiju.epizy.com/the_warren_buffett_way_investment_strategies_of_the_worlds_greatest_investor.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/kitchenaid_5_quart_artisan_mixer_white.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_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 5372 bytes
SHA-256: e0c263f5637f7171e45f56a0d257941f8610ce2a51251d7d1e059d486f8e331c
font_01_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 10952 bytes
SHA-256: e6a557da79a009198c2dba99f353a4a130252faa1ea9611ccad1e1096047df40

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