Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba407471db6d17a…

MALICIOUS

PDF

79.2 KB Created: 2021-02-27 23:12:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7afdafb3a96a40156c3c1f02ae9e48c1 SHA-1: d5a165a356215d7ab4c1eff5adeb0da4f2f46f87 SHA-256: 3ba407471db6d17a71f6f05c2ca20dc3ec982946d5886e6178f5f05e856e376d
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, identified as a malicious redirector and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users via malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=the+pit+and+the+pendulum+questions+and+answers+pdf
    • https://xepovilebifupu.weebly.com/uploads/1/3/6/0/136086158/3128991.pdf
    • https://cdn.sqhk.co/gujawovuk/1jcd0je/high_quality_mp3_voice_recorder_free_download.pdf
    • http://tupaxeguna.scienceontheweb.net/renodesojodujesuk.pdf
    • http://tijukilebag.getenjoyment.net/11709179254.pdf
    • http://wejuzofibab.medianewsonline.com/is_a_beats_pill_worth_it.pdf
    • http://vabakavolageni.22web.org/pidarisoguniti.pdf
    • https://jofetagade.weebly.com/uploads/1/3/4/4/134442540/noporobemopajanupika.pdf
    • https://cdn.sqhk.co/kajurineg/SWgh2R7/my_octopus_friend_trailer.pdf
    • http://dajexori.mypressonline.com/how_to_draw_easy_and_simple_landscape_for_beginners_with_pencil.pdf
    • http://sevezor.scienceontheweb.net/rugowokabowod.pdf
    • https://vominitaxa.weebly.com/uploads/1/3/4/6/134677623/pobimipeluwunix_mebofazizupedo.pdf
    • https://cdn.sqhk.co/kewixoretuze/f0jihiX/caponata_siciliana_ricetta_della_nonna.pdf
    • http://bewerab.22web.org/48326995462.pdf
    • http://duxinivodozular.mywebcommunity.org/conflict_resolution_examples_for_interview.pdf
    • https://cdn.sqhk.co/wuwoxegolewa/ehgiq38/dead_colony_money.pdf
    • http://rotixumuzu.22web.org/57514493254.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pamakejexo.epizy.com/antabuse_davis_drug_guide.pdf
    • http://pozidijapepore.atwebpages.com/rival_20_quart_programmable_roaster_oven_directions.pdf
    • http://fukutinupamebo.rf.gd/answering_machine_meaning_in_spanish.pdf
    • http://sasukagisodubex.onlinewebshop.net/impact_of_social_media_on_youth_research_paper.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f963.bin
fe3daae9270d4dba98eddebf8e364a3eb5ba7fe62f251dabb1727eab475d1797		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 5448 bytes
font_01_sfnt_off00010bcd.bin
469efcd204c7785fbbce3cf1c722b0fa1782abe1146f3bd874a4872c30dd6069		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 10224 bytes

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