Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c884ad1dfadfde…

MALICIOUS

PDF

80.7 KB Created: 2021-04-17 19:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 973de2e90322fe42d6f6a227fb79856b SHA-1: d09cc5dcdb92191a3a890b7b9bb7e1731c5922f3 SHA-256: 95c884ad1dfadfde1f4374605d39825ddd2b54228fe867647d55a302a956b9d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, suggesting a link farm or redirection mechanism. The primary malicious URL identified is https://jacksth.ru/strik, which is likely used to distribute further payloads or conduct phishing activities.

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://jacksth.ru/strik?utm_term=data+science+bootcamp+online
    • https://tadafemuge.weebly.com/uploads/1/3/4/4/134480681/pusev.pdf
    • http://nelomevasusuf.22web.org/tuzotizow.pdf
    • https://pimiwunuxijekez.weebly.com/uploads/1/3/2/7/132741089/xikove-dezopefegowutor.pdf
    • http://xtina.online/koch_industries_inc_annual_report0yne8.pdf
    • http://smartbright.club/ludakilodosr8etx.pdf
    • http://mutuseki.22web.org/used_corrugated_metal_sheets_near_me.pdf
    • http://jomikifu.medianewsonline.com/75443392337.pdf
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/6542696.pdf
    • http://deliwubavamir.mypressonline.com/95851895053.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/49400db4-c6e3-4559-b961-f13b0dd45caf/64468764310.pdf
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_77b9d34ff5734a3a9c33299f82a5c19c.pdf?index=true
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_ac1ef3e75a9f4f7981d1b6a9e00e722e.pdf?index=true
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_78b86d3601eb43beac85da82b0425ee3.pdf?index=true
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_9c9851ec53e24e43a2a481c4a09b89ef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bfee0d6d-223e-4f7f-a297-91c2fde81931/65436060685.pdf
    • https://uploads.strikinglycdn.com/files/63ef5f94-2fe6-44ca-9db5-8f94255a4141/91725630962.pdf
    • http://jasunusemoki.onlinewebshop.net/zapixapodenopezizasiwona.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_off0000fe85.bin
fd6be85b51fc6c756196378c06877fa05d0c83ea415d2872946811b61cdf8748		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 5120 bytes
font_01_sfnt_off00010fe5.bin
e8bd000d567cefccfcd713efbbe528a5cc37cd28f7f9c47261406e30ee456f54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE5 11016 bytes

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