Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99583264e976196…

MALICIOUS

PDF

77.6 KB Created: 2021-02-21 20:15:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9b041e8cc487da0dbca6c68d025cb5ce SHA-1: f0bddb28fee2993117c42295b347b05c23737535 SHA-256: a99583264e976196c9ba59174d1852c09e316edbfc41e6d52a23792bfb61429d
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one specifically pointing to 'bologen.ru', suggesting a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm hosted on disposable domains, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/123?utm_term=best+certifications+for+construction+superintendents PDF link annotation
    • https://cdn.sqhk.co/denobafopum/idvevhd/lakikerutap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_601a402b77976.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/3ggnghv/the_goal_goldratt_ebook.pdfIn PDF document text
    • http://jotaxanalesuti.iblogger.org/mpbou_admission_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465277/normal_5fc9fae233cf3.pdfIn PDF document text
    • https://cdn.sqhk.co/sobutexe/qC7jhhh/keyboard_for_roblox_mobile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5fe9fc5e69945.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/vpBqPif/bloomsbury_farm_haunted_house_hours.pdfIn PDF document text
    • http://bupatinewesep.66ghz.com/arachnid_hollywood_movie_tamil_dubbed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477387/normal_5fdbb79fdad44.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/HhfZ9wd/99860200241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393632/normal_5fc7a8d123b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_5fd8c16462e32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412403/normal_600ba5afcf7b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481993/normal_601ddb84d8e58.pdfIn PDF document text
    • https://cdn.sqhk.co/nipumusawobo/jggjhbX/fear_the_walking_dead_netflix_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/Y9iid0x/vikings_vs_the_world.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/hhCDpkO/introduction_to_business_management_erasmus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pesuvomekujidi.rf.gd/76508103922.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/android_interpolator_xml_example.pdfIn PDF document text
    • http://zulorokufejepa.rf.gd/xuvufubawog.pdfIn PDF document text
    • http://jozeratajugik.rf.gd/backseat_driver_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/tisuwatutiwopajiwerowodi.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_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 5164 bytes
SHA-256: 3ce1dae51e4c84df860688fcfff5114578df72c91b596cbf170dd47add5fa478
font_01_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 10940 bytes
SHA-256: ea2fc4dde05611ed2e242e3d16b94972fe7447d71deab6b32bdc668801ce2a01

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