Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f96afdb29fc6ac7…

MALICIOUS

PDF

72.6 KB Created: 2021-03-18 01:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3e9f098a89d1bd7149ed87c001922570 SHA-1: a609b61a57fb80db88c7f916569ca9cb4284d905 SHA-256: 3f96afdb29fc6ac74a760578061eb7c95e73bc7dc345174ef5f41cdb5c03f7b6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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://nipisod.ru/wix?keyword=learning+medicine+an+evidence-based+guide+pdf PDF link annotation
    • https://cdn.sqhk.co/zosiwutu/jhOiaKz/4180996573.pdfIn PDF document text
    • http://kogejirupu.getenjoyment.net/schotten_baumann_reaction.pdfIn PDF document text
    • http://fesurowejo.mywebcommunity.org/carol_of_the_bells_leontovich.pdfIn PDF document text
    • http://wutanumijejol.sportsontheweb.net/clinical_hematology_mckenzie.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/zopiv.pdfIn PDF document text
    • http://lixebafevoku.mypressonline.com/74870479681.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/2005_cadillac_cts-v_curb_weight.pdfIn PDF document text
    • http://jolovomolosubi.getenjoyment.net/dr_amen_ra_protocol.pdfIn PDF document text
    • https://cdn.sqhk.co/josutupamav/giJgyxa/world_war_ii_combatants_list.pdfIn PDF document text
    • https://cdn.sqhk.co/lipisowonili/KhdijOc/gekorawipopomefijekamuwan.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/70142042935.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_3fa85d139d8f498da888b839fe845c1b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78928c49-ec87-4350-95d1-2de5903f063b/89872442415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ec8281-9d98-4ef2-849f-83aa58cc53c1/89612164006.pdfIn PDF document text
    • http://bagugexasorip.myartsonline.com/how_many_calories_in_my_subway_footlong.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f87a5e9-d9f0-4eb4-a468-967e0af57e88/singer_201k_spare_parts_uk.pdfIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_83c6be5c601c4955af24e016f215a4b1.pdf?index=trueIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_6711cd2031f5438f9771a59747d714ea.pdf?index=trueIn PDF document text
    • http://juborekif.atwebpages.com/bapubazineweb.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_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 5616 bytes
SHA-256: bcb5409e626c13835dc5bf223753d7825bc6d2ae8f0ce8b27a1157d083a18748
font_01_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 10912 bytes
SHA-256: f89558293c7e6e116df579696e6d86b1046f9505ac488328daebcec13403dc01

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