Malicious PDF — malware analysis report

Static analysis result for SHA-256 9692df66f568f98d…

MALICIOUS

PDF

92.8 KB Created: 2021-05-08 01:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 733d97a77da71e85a654c1be339469a1 SHA-1: bf03475e7b32f9e4b5dc31be2806cb2bb824ecf0 SHA-256: 9692df66f568f98dc42e28da01d905a5135fea132baf1f93f6897403b7157bf1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM' pointing to 30 external PDF links. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically flagging it as phishing or a trojan. While the document body is heavily corrupted, the presence of embedded URLs and the heuristic findings suggest the primary goal is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=craftsman+25cc+gas+blower%252Fvacuum+parts
    • http://prizinsta365.website/john_updike_ap_analysisugrx5.pdf
    • http://govnosiakxws.online/polk_audio_psw100_powered_subwoofergght7.pdf
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5fd10e82c43b9.pdf
    • https://poxefapujo.weebly.com/uploads/1/3/5/3/135312596/7531713.pdf
    • http://karaulovlife.site/12250712657pswtv.pdf
    • https://cdn.sqhk.co/wopidevepip/jgfgegc/64273655176.pdf
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fe8bc4c705d3.pdf
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/ae06e4e.pdf
    • https://cdn.sqhk.co/xugiwatokax/O0ghchi/vcenter_6._5_update_1.pdf
    • https://static.s123-cdn-static.com/uploads/4458826/normal_5feb63ede6ff9.pdf
    • http://useporte.xyz/john_grisham_last_book_20202o3p2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a646ab95-355d-4020-9304-aadff647d950/nefumopofubotedemotam.pdf
    • https://uploads.strikinglycdn.com/files/c3fb4736-5a6d-41ba-91e5-b52f6c695b64/metal_gear_solid_2_sons_of_liberty_walkthrough_part_1.pdf
    • https://uploads.strikinglycdn.com/files/92f24448-0e37-47a8-86aa-0e3d913fd2e4/honeywell_quietset_pedestal_fan_white.pdf
    • https://uploads.strikinglycdn.com/files/fed035c9-d824-4f4a-8a65-b97614684d35/a_gentle_introduction_to_ros.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_off00012876.bin
b5ec804fdbe4f5a249d36efb5dc40b4343f0a63d6de0544d47b2de94c5c577f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12876 5824 bytes
font_01_sfnt_off00013c57.bin
a71423d6224ca111e62e4f9e31fafb188593a5c6b8c88cef4702338e5bd5924b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C57 12384 bytes

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