Malicious PDF — malware analysis report

Static analysis result for SHA-256 7662427e18cd2d37…

MALICIOUS

PDF

73.1 KB Created: 2021-03-29 10:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8bd095b9d0e914be1341b7043a37eac SHA-1: 8dfcb77f74c72e2d2ec58ae2be36a0da6ed33da8 SHA-256: 7662427e18cd2d372e2e5757ee9e786481b83deb37adf4c5cd7c7fafbb20215c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as service coupons for a car dealership. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest the document is part of a link farm designed to attract users to potentially 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://soxebez.ru/wix?keyword=fitzgerald+toyota+gaithersburg+service+coupons
    • http://zixaxagewan.mypressonline.com/27814534411.pdf
    • https://cdn.sqhk.co/peposusuwi/iggibig/16868735663.pdf
    • http://dowotezovemalo.mygamesonline.org/pefusafotagovera.pdf
    • https://static.s123-cdn-static.com/uploads/4376374/normal_5fce671fc3edc.pdf
    • http://eurozone.pro/902815433542lqmi.pdf
    • https://static.s123-cdn-static.com/uploads/4374369/normal_6000ae87de9fe.pdf
    • https://cdn.sqhk.co/purorelaz/ghhbicm/vupalanipotuwakip.pdf
    • http://hookup754.fun/troy_bilt_tb22_fuel_line_diagramzs3qh.pdf
    • http://knitfqph.site/lafejomederilogislbcik.pdf
    • http://midimox.getenjoyment.net/the_gettysburg_address_answers.pdf
    • http://usblighter24.site/95329190623jaec3.pdf
    • https://cdn.sqhk.co/nefakovuwot/ihifjgL/usa_online_shopping_app.pdf
    • http://br1.red/como_hacer_un_horario_de_estudio_en_casa_para_nios0ntu0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_853df0a2256141cbb737329c0cc80610.pdf?index=true
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_06b281e5084e4601b366fbc98db765e9.pdf?index=true
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_86e7e7af98334390976aa5215699fc1f.pdf?index=true
    • https://9505ca4c-dfdc-4941-8fde-ded35496d0c9.filesusr.com/ugd/2097ab_465ad8e81afd40828dbd32f7ed821f28.pdf?index=true
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_74aadc232b974a5bb84895ba20bf44b1.pdf?index=true
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_a17422875aba4d14b77408ebe4e72d19.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_off0000dead.bin
dad145b9ef9a60c27e3b98ff747cd2ff759cc254a6807ddf29cb7d390a0c8679		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 5640 bytes
font_01_sfnt_off0000f1e9.bin
3688f429940ba3d44bc07245d0c9a559e83a363835bb3b687ff5ca31a42f8eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 11004 bytes

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