Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcb56b7edb0af8a…

MALICIOUS

PDF

70.3 KB Created: 2021-04-10 20:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3003785f8e77c52dc441a02e99f21f45 SHA-1: 7a92b57dce822d2a340d8d1cd82e7df94596b315 SHA-256: 8dcb56b7edb0af8a0aa3ed352a5c05bcf6c7a6b9d980089cede6c29097647f1e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, suggests a lure related to downloading presentation materials. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://vilenefex.ru/strik?utm_term=oracle+database+11g+sql+fundamentals+ppt+download
    • http://jifarobajis.sportsontheweb.net/vascular_plant_systematics.pdf
    • http://sipataj.sportsontheweb.net/98323673247.pdf
    • http://javaxirivibewi.mygamesonline.org/rozuvulifijubujuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitajosasa/raraw.pdf
    • http://nejesezape.myartsonline.com/64227322402.pdf
    • https://s3.amazonaws.com/davawina/wotebewiwewepofifi.pdf
    • https://uploads.strikinglycdn.com/files/226a89be-3a47-47fa-b056-193f3e434751/what_size_is_30_in_jeans_uk.pdf
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_0231972319384e7f930049ccbf8cca89.pdf?index=true
    • http://fuwotegof.rf.gd/31260225111.pdf
    • https://s3.amazonaws.com/wesezuzuvalirik/36628847540.pdf
    • https://s3.amazonaws.com/sezebepit/pivivelowatukujipolabema.pdf
    • http://tunemajemopetuv.epizy.com/dukuxigutanas.pdf
    • http://pupekulojam.epizy.com/nonafagevajetal.pdf
    • https://uploads.strikinglycdn.com/files/39a20636-d02f-4dcc-8caf-312d09b949b8/place_value_chart.pdf
    • https://s3.amazonaws.com/xalexojaxipud/all_sat_tests_reddit.pdf
    • https://s3.amazonaws.com/mujesogi/18404705136.pdf
    • https://s3.amazonaws.com/girilifawuxi/lg_g_pad_7.0_factory_reset.pdf
    • http://babevuzax.epizy.com/mibevevofalutitisip.pdf
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_4fb082a62edf40f0a95075c70eeb3385.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_off0000d47d.bin
b3a30ccd13aeded598ea0b6a56cb3bbb254d02d385cdbed2388d2aa4e207860c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD47D 5912 bytes
font_01_sfnt_off0000e889.bin
69a21039ebb196e2fc8f8107403289b986b893927650a11377883a07300a7129		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 10224 bytes

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