Malicious PDF — malware analysis report

Static analysis result for SHA-256 2906daacdc4008f8…

MALICIOUS

PDF

83.9 KB Created: 2021-03-28 13:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c61d6c4e391979e9ec6ddc0927dc9c0d SHA-1: 72788173c4797255211600ece7758e1cd9c058cf SHA-256: 2906daacdc4008f80c64eecae72e7a13802bbbe8e30f2e0a6146c1182b3af6ed
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 are to unknown or potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=how+to+test+your+left+and+right+brain
    • http://sellforce.ru/9109848865il8zs.pdf
    • http://55571.ru/lowukenipat2wt02.pdf
    • https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/7158900.pdf
    • http://mebelrostov.ru/graco_snugride_30_expiration_canadavhhd2.pdf
    • https://kakifiku.weebly.com/uploads/1/3/5/3/135347754/9f4afe65.pdf
    • http://karaulovlife.site/podavenejigilebasejoezcjr.pdf
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/5062834.pdf
    • http://tikovg.xyz/dufufaburhkpr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_3bebdfe3932c431dbee7b5feac454214.pdf?index=true
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_231533222040482da6a603993d7a8ca6.pdf?index=true
    • https://s3.amazonaws.com/rogugagatuf/how_to_read_vishnu_sahasranama_in_kannada.pdf
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_c8b2e4d05d7d4fd69aa849a9d16ee666.pdf?index=true
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_c0f548a1efc14afebecc1a9bd9d01811.pdf?index=true
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_3643abdde1334182ac8014d0a2b9e0ae.pdf?index=true
    • https://s3.amazonaws.com/woxojuxafopuv/wozugu.pdf
    • https://s3.amazonaws.com/nagev/kinubafupotebom.pdf
    • https://uploads.strikinglycdn.com/files/44de3311-6027-45b2-b6b3-00e7cc14cdb1/trane_xv80_ignitor_part_number.pdf
    • https://uploads.strikinglycdn.com/files/11b915ad-edd1-469f-a087-d05456803bd6/where_to_buy_google_cardboard.pdf
    • https://uploads.strikinglycdn.com/files/3a3adbbe-a657-4288-befb-f03e2e4436ea/how_to_clock_in_and_out_using_adp_app.pdf
    • https://uploads.strikinglycdn.com/files/a84c08d7-1e3b-45c6-aa94-79260439b548/guitar_chords_chart_for_beginners.pdf
    • https://s3.amazonaws.com/wiwuxot/wunewijajaxoxapo.pdf
    • https://uploads.strikinglycdn.com/files/5cb99d6e-179f-41c1-969e-86ab6c263ad3/fukebis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbfe.bin
7e5be146a4eda9b5e5f79f557d25af9ebc2a692f30f6344a8e4563f7d57f630d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 5348 bytes
font_01_sfnt_off00010e38.bin
1f63d31daa2c5dc382c050d376c6c40dd1e5d34ce0d9c5e057c003cdaea473b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E38 10928 bytes
font_02_sfnt_off00013389.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13389 4324 bytes

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