Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6052450708ffb25…

MALICIOUS

PDF

113.7 KB Created: 2021-03-16 06:09:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f1331ddff765caf65f3d620ca8e07875 SHA-1: c7a5b4f7edc5bb6f1b25da74c3fb7a655e6213d6 SHA-256: a6052450708ffb253eb20a977ae5998d2a939c93b4e0240db9e0cf6d4012139e
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ponafet.ru/award?keyword=organized+crime+book+pdf PDF link annotation
    • http://wotukujis.sportsontheweb.net/691764877.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/which_engineering_course_has_more_job_opportunities.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/what_is_lost_at_sea_meaning.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/98306742505.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/67106869896.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/excel_vba_select_last_cell_in_row_with_data.pdfIn PDF document text
    • http://gizigevom.mygamesonline.org/drinkwell_platinum_pet_fountain_troubleshooting.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/infiniti_g35_transmission_fluid_location.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_f48b2228d35d4da8a63ab903b4074b1d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/683465b8-5c31-4812-8062-d633be79645c/18300392393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825fcfe5-95c2-4bd9-8371-afc1aa54b779/xijetipiparuxuwaxawowugoz.pdfIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_fed039ee6e924a72a704c26507ef625f.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_fa6d7c0571db47f089c3a948ba1e3a0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b49049a-65e4-457d-8c94-c3b51be07e51/dorian_gray_summary_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca9615f-d02a-4c0c-988b-bfcb467dcf1f/punctuation_worksheets_for_grade_7_with_answers.pdfIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_822c0a06c53b4603bbe83a8f4703a46e.pdf?index=trueIn PDF document text
    • http://tavamikilav.myartsonline.com/16514818588.pdfIn PDF document text
    • http://bebojivim.myartsonline.com/22388663319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1012a8c2-b531-46d3-b3bb-69c6dc8cc3e1/korosotoval.pdfIn PDF document text
    • http://rogomore.myartsonline.com/fluent_python_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46e3e66-d47c-4b80-aed1-5d268c677659/vogoribawareda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0adea76-6994-4015-9c88-a8ebd08edcec/what_are_the_specials_at_sonic.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001652d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1652D 5544 bytes
SHA-256: a623239f76ae63fe9c335aefff921389971968baa9ad1acf37db19fd912020ed
font_01_sfnt_off000177fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177FC 13008 bytes
SHA-256: eaf1318e24117684e3cc55c22f87460d46fd69fb4054a2a20591c40e6c0668b9
font_02_sfnt_off0001a3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3EC 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f