Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9695d97d416b3b…

MALICIOUS

PDF

73.3 KB Created: 2021-03-15 04:37:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e49a637e07b86f3b5322cf09e18b30b2 SHA-1: 570e7b6e0beefe8b0cb20b31b30fa9ac31d4b554 SHA-256: 5a9695d97d416b3b73628f9fbc6dda09cdf060b471ec90a0599a2b27a6e4b509
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, with the heuristic PDF_SEO_LINK_FARM specifically identifying a link farm. One of the embedded URLs, 'https://xezojetit.ru/strik?utm_term=what+kind+of+salad+is+good+for+weight+loss', and another starting a link farm, 'http://dronextactical.xyz/mipepagagabusotuxemosuwc11qy.pdf', are considered high-priority IOCs.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=what+kind+of+salad+is+good+for+weight+loss
    • http://dronextactical.xyz/mipepagagabusotuxemosuwc11qy.pdf
    • http://educationonline.website/gikepezulubatukisifenofxds.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_fbd6a2ff3e1843f3b901c4aee24c0a4b.pdf?index=true
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_495c3ecb338840a39c8ce82251954d79.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e2efaffc-2b70-4647-99e5-27255cf55e9e/visokurum.pdf
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_91db77c63e8c485293575a9dfd419fd0.pdf?index=true
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_be5f01f0e3954a78b126964c32115292.pdf?index=true
    • https://uploads.strikinglycdn.com/files/268cb22e-2154-437f-819f-bd0f3ab3408b/how_to_view_your_house_on_google_maps.pdf
    • https://s3.amazonaws.com/bodajaku/video_maker_android_terbaik.pdf
    • https://s3.amazonaws.com/zijivevip/balewug.pdf
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_53e6a61129a4418392b14667881aa8e4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d02472f4-6c9c-4cdc-b12c-be99f0db7835/hp_deskjet_2542_scan_to_email.pdf
    • https://uploads.strikinglycdn.com/files/a1718d89-2bab-417d-965b-f8b3ce751b2f/95330131153.pdf
    • https://uploads.strikinglycdn.com/files/496ddd77-2eee-42c7-89cf-0a69a2f3af11/14667175457.pdf
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_46b3b90219144fb6a6829fa22f5b3ff9.pdf?index=true
    • 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_off0000e144.bin
db620760353db7bc5d9ac54cb0f4c92b51ad3539e8cb2507109b1b80bcf980fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 5340 bytes
font_01_sfnt_off0000f380.bin
06efb96c19fcc257874c38ddbdbb96de2931f984468a6075c480d364322c2fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 10604 bytes

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