Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b0d2eb28f002ab…

MALICIOUS

PDF

77.2 KB Created: 2021-03-25 13:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50fb55f75cd7054738ed77a2095d59ef SHA-1: 94be43f9ae07968ca39bfed9281c6421f4a37f5a SHA-256: d4b0d2eb28f002ab25b2c55617d273949222a3d91a3320340af27b96e0ea483e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains keywords related to 'Arcgis manual label placement' and 'wkhtmltopdf', indicating a potential lure to trick users into visiting malicious sites. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://golowaki.ru/wix?keyword=arcgis+manual+label+placement
    • http://salizurewaki.mypressonline.com/8053759569.pdf
    • https://tisefujuset.weebly.com/uploads/1/3/4/4/134488269/6c42458f9cd83.pdf
    • http://rugegav.mywebcommunity.org/sawodigifokosa.pdf
    • http://ejinaya.com/85080790399a9p1x.pdf
    • http://detonic-deutschland.website/duplicate_marksheet_du_sol82wpq.pdf
    • https://xesukalo.weebly.com/uploads/1/3/5/3/135311970/laxadizolepi_zejatut.pdf
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/1314527.pdf
    • http://labifovejes.mypressonline.com/wacker_neuson_spare_parts_catalogue.pdf
    • https://didunoduwogu.weebly.com/uploads/1/3/2/6/132682107/vedepomewop_zarorixetaxawo.pdf
    • http://gavediteriremuv.medianewsonline.com/causative_verbs_examples.pdf
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/4287164.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_c4e1f418b54f45078d87b0d2253b0c7b.pdf?index=true
    • http://lazuletezofik.onlinewebshop.net/tusiwominizanunag.pdf
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_a660afe28b5f4c91b62bae2ab27493ce.pdf?index=true
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_2be20cdb491440f08a9358d00f8fd061.pdf?index=true
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_422a1815209548cfae4832e4a0f2277c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/665a058b-bea7-4ddc-880c-591f1fb50b03/78290846580.pdf
    • http://jagomizaf.atwebpages.com/april_2020_current_affairs_in_gujarati.pdf
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_560c499ba3c64981a6563628ecc01976.pdf?index=true
    • http://lusajafimaneru.myartsonline.com/68797527027.pdf
    • https://uploads.strikinglycdn.com/files/a2239d1f-c8fe-4b34-bfe0-5d8ca53d13e0/xonij.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_off0000f030.bin
d618f59553c0dfa2ad7b335a3108a3efa7a83cca7019efd45687cda9653fc889		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 5380 bytes
font_01_sfnt_off00010267.bin
5609a08e9ffec07b174cf4c46908da6b73bd7d727718bf40c411f8558501e4a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 10912 bytes

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