Malicious PDF — malware analysis report

Static analysis result for SHA-256 81185d640bd06eff…

MALICIOUS

PDF

77.1 KB Created: 2021-03-30 03:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b9bb6d91afeeeb150e3ce12afbbd3b2 SHA-1: 7c05c6e285498dcaf267e57f10ceaf00472227dc SHA-256: 81185d640bd06eff33cfe5ca71cf2364909cc603016dbb32581fa8e10b2e7171
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=eight+letter+word+starting+with+so
    • http://kinoxca.xyz/weber_grill_restaurant_menu_st_louistm8q9.pdf
    • http://tipofeliluget.medianewsonline.com/blue_iris_alternative_linux.pdf
    • http://inscarusa.info/free_printable_iq_test_with_answersm2shq.pdf
    • http://kimidenexikox.getenjoyment.net/xunogenenuzejigedezomi.pdf
    • http://niwopofe.scienceontheweb.net/bulowa.pdf
    • http://vashe-zdorovie.xyz/ross_casebookptact.pdf
    • http://pewujok.mypressonline.com/fallout_4_companions_react_tumblr.pdf
    • http://jevosetixa.iblogger.org/xanikepujamuzuwabevi.pdf
    • http://study-english-05.site/jekejixisinilesisefln81t.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_eaf6574d34664cd78605c71ad9c79c13.pdf?index=true
    • https://s3.amazonaws.com/rafiralexezol/60334899215.pdf
    • https://s3.amazonaws.com/gowupuzokowuxes/78273018184.pdf
    • https://s3.amazonaws.com/tugabijenovili/83353936517.pdf
    • http://kogisovaf.epizy.com/rububivixozomelexodizon.pdf
    • https://s3.amazonaws.com/bejexe/jopuzow.pdf
    • http://zelagipu.rf.gd/ratika.pdf
    • https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_3957d6570eb241c2941d38e8fd6f6411.pdf?index=true
    • https://s3.amazonaws.com/gezejoputiwinu/ratovamegubowotun.pdf
    • https://s3.amazonaws.com/sukedil/descriptive_writing_planning_sheet_ks4.pdf
    • https://s3.amazonaws.com/bulolimepol/73364003755.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_off0000f0e7.bin
e39f3225a7aa3ddc483480962c3014b488f7ce5cf8a3723b67dea68f52eeed2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 5136 bytes
font_01_sfnt_off0001026d.bin
dbdf9577af2fd46673441c5285c7739075fb577a5e842d98d3f782e19ca0a68c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 10824 bytes

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