Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4ce5499d02b647…

MALICIOUS

PDF

82.7 KB Created: 2021-03-30 21:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4a000dca44dfe069583cdf46174b1979 SHA-1: 9bd48d933390a3a75e2874c61005d70749ef990e SHA-256: 0d4ce5499d02b6478f9422ea05a4c557a9cd96d71b61091e02ef121b69de05ae
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/123?utm_term=informatica+interview+questions+and+answers+for+freshers PDF link annotation
    • https://laxivaxof.weebly.com/uploads/1/3/0/8/130874385/963531aee65a0.pdfIn PDF document text
    • https://zubenori.weebly.com/uploads/1/3/5/3/135394140/soseforipabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_359438c8913849d4a91eacd8c82d38cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/769ca7b3-fa21-4c25-a92d-f245656ecafd/white_christmas_movie_cast.pdfIn PDF document text
    • https://6776ac3f-883f-499f-bc52-38dff818ec46.filesusr.com/ugd/969751_b6c00bb70ff04fe1a1ee45dfe34fae45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f606ec46-c890-4fa3-bf6f-276c2bca0a72/demosivirewanevetivosugug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35bec9a7-6d55-4c27-a818-1f6b0121b04a/bokigive.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_1d2ad98fb4844962bdce2c2f7b9725a7.pdf?index=trueIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_6cc3a6a5073148afaf3006775549ab9e.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a7c1c747b7f047369b6410779e8961e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d82c83d5-2f96-4119-b2c1-146c99d399fe/kemper_profiler_amp_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f439c8c5-3ee9-4bf9-9c79-65291029485e/lefomuwiva.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_c93b785509b844e696b84c2ff5263811.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29fc793a-85a9-4301-881d-3ac70256791e/dinunozowel.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_19109ea0b7c0402987539d5e72e21dfc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3a0a8f-8eeb-473b-a3f2-6efaf8155e7c/best_algo_trading_platforms.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_bd8750b6889c4bfb8d9a49600951da70.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_9d4cd4b7b6514a999759c8d2509b1244.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf95144b-5b47-4166-ac54-27d1f1fd22f8/john_deere_la145_parts_near_me.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_off000107b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 5444 bytes
SHA-256: 3901db0c7d350749686b89fd857ccfc17acdcf480ab034bb844e28d64cafd64f
font_01_sfnt_off00011a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 10544 bytes
SHA-256: 3b0008f822b62c4782e57b0e9e586ad50ed809d6e0edf4f3597b38a888fb0823