Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8373859a6638c4…

MALICIOUS

PDF

89.4 KB Created: 2021-03-03 20:43:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ce8fd64b38a28aa4db460eadbbaa6bd9 SHA-1: 25d0e5d61ee8426fdaf3a8f977c9341d28bdfef5 SHA-256: 8e8373859a6638c471e1b5ce1ddb819725906aa70966e5ba4510d13d1fe24116
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting an attempt to direct users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'incremental innovation', likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=what+are+some+examples+of+incremental+innovation PDF link annotation
    • https://vejarava.weebly.com/uploads/1/3/1/0/131070596/5632348.pdfIn PDF document text
    • http://websporizlehd.com/64010712117emfl6.pdfIn PDF document text
    • https://jasugupaxawuz.weebly.com/uploads/1/3/0/7/130740610/zuluwuwumeta_xujidirit.pdfIn PDF document text
    • https://gatiwisukebemo.weebly.com/uploads/1/3/1/4/131438587/11def06242.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/31131514245r1gnd.pdfIn PDF document text
    • https://kapegidaboxisi.weebly.com/uploads/1/3/4/5/134527108/girazitakolejufi.pdfIn PDF document text
    • http://info-pages.ru/jonnyguru_power_supply_buyers_guideds5si.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/1a58e05e7a2ee17.pdfIn PDF document text
    • https://pokasejazutiz.weebly.com/uploads/1/3/4/4/134447431/vimafogijelumo.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/can_you_get_a_drivers_permit_during_covid.pdfIn PDF document text
    • https://fomuropuzukamu.weebly.com/uploads/1/3/4/7/134728801/jukakepulegif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepofif.onlinewebshop.net/galaxy_dx_959_power_mods.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/fidaxupamikosokesi.pdfIn PDF document text
    • http://dopovis.myartsonline.com/31742304534.pdfIn PDF document text
    • http://ratobewiwigu.atwebpages.com/what_part_of_the_brain_controls_art.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/75860411594.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F55 5396 bytes
SHA-256: d7bb033ad9d3f434fa4bf53b3964619c71d4f24c5169aa845289d05de75ac9f0
font_01_sfnt_off0001319a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319A 11392 bytes
SHA-256: e37d5aaf1c9cf8e9f6b2dd57e829e87ad2bd91ecfedbc248e62cad8435559d07

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