Malicious PDF — malware analysis report

Static analysis result for SHA-256 8402d21be58abb5e…

MALICIOUS

PDF

80.0 KB Created: 2021-04-08 21:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 580a32a07875a1ff61c431136e292002 SHA-1: 2d83e64a75d69380aa5dcb67d15c79da765e1563 SHA-256: 8402d21be58abb5e98e7b108fba38eccbcda4ba9eed5dfcaaf538ca1cab0a809
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or redirectors, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=nutone+central+vacuum+parts+model+350 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483337/normal_6003dd35762b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461761/normal_5feb9f1d2718c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529024/normal_6006d753cb039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456398/normal_6049d408bf03e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_604eb48a02b98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369327/normal_5fe5468c3cf95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_25d9eb42d6504dd1a33325c3dd3b14fc.pdf?index=trueIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_ba937696ad774619a53fbd39fe86132b.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_8cd634f9c67a47d28a0b7503858921bc.pdf?index=trueIn PDF document text
    • http://pekamidakoj.atwebpages.com/the_sense_of_an_ending_explanation.pdfIn PDF document text
    • https://b1d4f555-1eac-4d61-aa83-27206cf3ee4b.filesusr.com/ugd/1706f5_dd531ad8710543569a9756016942ed15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/799511bd-a5d2-413a-a581-0aa54cd4c216/noco_genius_5_battery_charger_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c47a06-963a-48bb-b188-cc03b68d45fc/part_time_english_dictionary.pdfIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_4e696a650a7d416a96825c2ff1f8ceb9.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_a2fbb782daec42f2b0bcda14878bd896.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_2bf640bf4e6946daab9b831d40dfbd8f.pdf?index=trueIn PDF document text
    • http://dezobod.onlinewebshop.net/morabexavidizowo.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_819626cc5d4a45c3ac204298bb6b7612.pdf?index=trueIn PDF document text
    • https://60b161a2-b511-46bc-b48c-7ca4331f2db3.filesusr.com/ugd/34b71b_4a7c28994f6c41938371db6e972dbda3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7be35c5-0cb9-46ec-a57e-ac14251ae40d/does_hannibal_lecter_ever_say_hello_clarice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c50b8fa3-2113-4f22-9c7a-a1af67747d7a/47317392685.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_588590ca4c8644bdb7b2f95b212c9f3c.pdf?index=trueIn 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_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 5680 bytes
SHA-256: 1eab656adb603900364e72f3658df064788db80cd93740c47650e62c85f797c6
font_01_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 12900 bytes
SHA-256: a4faf45dcba07cea05afe4dca2904885f7871a7300a7d740b95d51e7367b84f3

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