Malicious PDF — malware analysis report

Static analysis result for SHA-256 14fa3eabc1fc9237…

MALICIOUS

PDF

69.7 KB Created: 2021-03-22 02:49:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c4426694eb780fafb88ef953944e9af3 SHA-1: f630c9d564161a4ab8bf0e628f368d8c56b76212 SHA-256: 14fa3eabc1fc923725022930b39143e37c1c71910fdf43274edf31543ac0276e
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, with 'https://maypoin.ru/award?keyword=levetiracetam+davis+pdf' and 'http://ryukzak.digital/160272689684d55o.pdf' being particularly suspicious due to their domains and query parameters. The PDF structure also indicates it's part of a link farm, further suggesting malicious intent.

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://maypoin.ru/award?keyword=levetiracetam+davis+pdf PDF link annotation
    • http://ryukzak.digital/160272689684d55o.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/39763683455.pdfIn PDF document text
    • http://mmuuue.space/best_free_weather_apps_for_ipad_2019pzn0i.pdfIn PDF document text
    • http://prodson.fun/59091019039jxww8.pdfIn PDF document text
    • http://winoraama.website/microbiology_introduction_12th_editionxtok0.pdfIn PDF document text
    • http://segwaywheelchair.ru/34100676183tdigh.pdfIn PDF document text
    • http://gifinibufenatar.medianewsonline.com/nofupi.pdfIn PDF document text
    • http://bunnygummy.ru/36712674096fbjua.pdfIn PDF document text
    • http://serdyukov.pro/foluruxo9fxqa.pdfIn PDF document text
    • http://docita.fun/wirimiramikizotadexagaziyze2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_4900687299f74074a4bef187a53555e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e16be9b-a616-4af9-ae5f-643b095d4f1f/bram_stokers_dracula_character_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/a_death_in_the_family_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e266d108-174d-4eb3-99f5-82abdef38ea4/68468442178.pdfIn PDF document text
    • http://zimopup.myartsonline.com/8718165612.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_f61ad9561a3f482ba0bb55a877337b3e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/gazibom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8acf4b8-bfde-476f-a05e-7f2955b57484/how_to_fix_a_garbage_can_lid.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/how_to_turn_off_camp_on_nec_phone.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_off0000d2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B8 5268 bytes
SHA-256: 7858efc93ae7dc0078d816580163e21b87b5847a723efb8e5a9064fe7c55a5db
font_01_sfnt_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 10892 bytes
SHA-256: c851f3941f684f03c7dfda71ffc74289656713d4c131f860fd7e3aa6b1de1926

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