Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d7adaf9c85bdcc…

MALICIOUS

PDF

83.2 KB Created: 2021-03-18 07:28:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4af0b542384f047e1d756f682e6e7c8c SHA-1: d4de5ed22024fc79b42bd057aaa703b95f1d7b8e SHA-256: 92d7adaf9c85bdcc6c7592e97bcaa8968eac194995a3497f31f7c421fca6515c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the document's structure suggest it is designed to redirect users to external sites for further exploitation, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=full+form+of+mbbs+dch
    • http://gejedesoni.getenjoyment.net/19777353848.pdf
    • http://mejumafegebameg.mygamesonline.org/tiwafo.pdf
    • http://rexonina.medianewsonline.com/goal_setting_worksheet_for_students.pdf
    • http://fepemewavitik.66ghz.com/zegavenarofuvove.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nowivopikuzud.epizy.com/cdc_infection_control_guidelines_2015.pdf
    • https://uploads.strikinglycdn.com/files/d8b24fd2-b0c3-4937-9c5e-74a8f2ec64e4/57799547643.pdf
    • http://guriseb.myartsonline.com/abc_english_book.pdf
    • http://zibelasavu.atwebpages.com/96205700719.pdf
    • https://uploads.strikinglycdn.com/files/0e4063ba-22cd-4bf9-bd46-14f9baa218b4/how_to_repair_timer_of_washing_machine.pdf
    • https://uploads.strikinglycdn.com/files/e76a1191-1335-4ea5-8f97-b9bb5d4d274d/can_i_take_my_permit_test_online_in_arkansas.pdf
    • https://uploads.strikinglycdn.com/files/6af2a19f-936c-431b-851f-b8f16e30fa52/57227456409.pdf
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_3c3ab208b85b46faa7791673d70084b4.pdf?index=true
    • http://muluwokixo.onlinewebshop.net/gubumu.pdf
    • http://mevuzulutifoxa.rf.gd/19728901130.pdf
    • http://zizenatoxu.myartsonline.com/how_to_write_a_formal_lab_report_for_chemistry.pdf
    • https://uploads.strikinglycdn.com/files/f6c222e4-f1ce-49db-89d8-cac196efa6aa/8984581179.pdf
    • http://felugibesixe.onlinewebshop.net/lamebi.pdf
    • https://uploads.strikinglycdn.com/files/a2431fc6-2f07-4c09-af94-4b2a60ecd8a4/75990733113.pdf
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_a407066d07c24e50a8b40a9ec91048e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a3919dfe-2d80-468e-9cb7-e1e426a85f02/63975935755.pdf
    • https://uploads.strikinglycdn.com/files/ededc189-8cdf-475b-b3b7-25b474c25c3b/how_to_reset_a_motorola_walkie_talkie.pdf
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_e14a796f229345b098e76e1a1a97031a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/612debb8-1313-479c-afcc-a78deb8193b2/gudubedidugafinabapesemiz.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_off000109bf.bin
3d53614bec4c34dac862ead349b6a20808d641de45b10af6a23853481fe43afd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 5144 bytes
font_01_sfnt_off00011b14.bin
bc6223b02020350d21e0b5d84e863d314c3437b5c02664e18d6e4bd6b7b89b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 10636 bytes

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