Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fabf48c6437ee8…

MALICIOUS

PDF

75.7 KB Created: 2021-03-20 11:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 129601060a7db937359471204130e372 SHA-1: 50fb2a39db1a26da74d3f691fa215c3aeb1245c5 SHA-256: d9fabf48c6437ee89576a43dcaf4854a1d4f1efa1fd888f3fd5ce3f3fe08f60c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as a phishing trojan. The embedded URL 'https://midufefew.ru/award?keyword=canadian+citizenship+test+pdf+2020' is suspicious and likely leads to a malicious site. The document body, though heavily obfuscated, contains keywords related to the citizenship test, reinforcing the lure.

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://midufefew.ru/award?keyword=canadian+citizenship+test+pdf+2020 PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_65b48166e1c94948bedeaedee16b8c35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/number_the_stars_vocabulary_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91bb276-345d-469a-86e6-700c4c755885/hp_pavilion_dv6000_charger_problem.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/scratch_3._0_pc.pdfIn PDF document text
    • http://vefagukolile.epizy.com/lasefi.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/a_river_runs_through_it_book_free.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_eedf80df33d8465db66224d937c4e465.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_b00be60196f444c2835c6c2db1bea26b.pdf?index=trueIn PDF document text
    • http://bosulug.epizy.com/5577651670.pdfIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_bb7f6b7d8a0e4bc1acf04351791bf269.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de8870a3-a51d-4d78-9a53-8a242eb18740/canon_speedlite_430ex_ii_flash_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c56e71-f8e3-4a8d-b57c-41fa2e6aead6/55208504953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06df7b91-fa15-4555-9d9c-bc57f2249fdd/fuzupugiwuvane.pdfIn PDF document text
    • https://aaf2f8d8-4593-4070-95c3-ed2308805076.filesusr.com/ugd/337eea_13add47d903e44819a6dad11055d7548.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_315bc183fe5545b2ae7dfaa2f826fd77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/xewigofenibidamebatulodox.pdfIn PDF document text
    • http://tusibav.epizy.com/43952977146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9fab7ab-d12d-4d63-bdec-8b53a14a3055/denon_avr3313ci_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a2e5426-70c9-4ad3-b3be-7a7736f2d112/wifiwexilaforajavika.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_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 5344 bytes
SHA-256: b0534ad874742b2d30e1f3a661cc5d07fcbf365a784cacda2112f45fb2b35865
font_01_sfnt_off0000fc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9F 10868 bytes
SHA-256: f80396d3116bf49cbab0bea5be4ddd8f2a2c846331bb7eec33e080d3a02267e0

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