Malicious PDF — malware analysis report

Static analysis result for SHA-256 e693fcb231d32562…

MALICIOUS

PDF

67.1 KB Created: 2021-03-25 07:12:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 187b53145c5e91a7d4188fa0e00d614e SHA-1: 4a79e7a9238828636deccfc3c654956cfdd1f3b6 SHA-256: e693fcb231d325623ebefb93250efdce8f9c1f5595e37ee4db67502d2605a3a9
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 generated in a pattern suggestive of a link farm or SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

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://nipisod.ru/wix?keyword=heart+of+stone+lyrics+chris+knight
    • https://cdn.sqhk.co/zuxafopagad/cPsIaif/88410081603.pdf
    • http://ctuxuu.com/vodevoce9os.pdf
    • http://moresukko.ru/rixezeqcoqd.pdf
    • https://cdn.sqhk.co/baresupujar/xighgib/fatal_fury_special_pc_engine_cd.pdf
    • http://vasakuso.sportsontheweb.net/cyberpower_gaming_pc_wont_turn_on.pdf
    • https://cdn.sqhk.co/nedovipirumu/8jilhX2/12844129116.pdf
    • https://cdn.sqhk.co/zunowexafa/imifMsR/kart_stars_mod_apk_1._12._5.pdf
    • https://cdn.sqhk.co/letiludixo/icMMje3/custom_maps_minecraft_1._16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/votuweroxigezog/59963320865.pdf
    • https://s3.amazonaws.com/megujobemegor/87133787824.pdf
    • http://solezod.myartsonline.com/julilona.pdf
    • https://s3.amazonaws.com/legipalofi/77232133887.pdf
    • https://s3.amazonaws.com/dudurat/how_to_measure_indifference_point.pdf
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_d6f73c734f8a44199ec763c62caa7ef7.pdf?index=true
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_953694beb8dd4cb6bd4917af6042c009.pdf?index=true
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_428ff8dcefb0464a87e0d14f4c5bc9a5.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_off0000ca41.bin
4e9f2ae95f8db45ecf5db0ff00ec52076ca5e4c9c72b504fecbff9070680d1ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 5272 bytes
font_01_sfnt_off0000dc35.bin
742132e16eb396a112f82a61eb43287719da081097d40381adfa7f622508f7f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 10352 bytes