Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a0396acd765847c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 09:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb0862e17a92b5f7e85311ebe77cde88 SHA-1: 2f9fa93b236f23ad4dc2edd12c30738dff75c530 SHA-256: 8a0396acd765847c844221e9f639e9c0900d2a577bc30f76e04fff411956c5b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable or unknown hosting, and one heuristic identified it as a link farm. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://poddertradingandindustries.com/userfiles/file/51785969408.pdf In PDF document text
    • https://hotelcorona.ro/files/22455548109.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/tifalifonifagenefa.pdfIn PDF document text
    • https://forssh.com/userfiles/file/bafexebok.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/30914557177.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/xoroxeri.pdfIn PDF document text
    • http://skolky.info/foto/images/file/zuditaxalusuwojufanis.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/14807377916.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/nekurutozizeweg.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a3c69a67---vaxenovapivibamibejiful.pdfIn PDF document text
    • https://arerp.kr/data/file///24012050322.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161351fcd0c10a---62043315570.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/divurikazuzasidezunigibeb.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/13978969780.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/22681700130.pdfIn PDF document text
    • http://wasael.com/userfiles/file/19214570480.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/biruzejobonaxi.pdfIn PDF document text
    • http://clingac.com/d/files/gimebitegap.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/tifotabokusek.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/26838559193.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/78775624470.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/67252650232.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109122357447987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+game+booster+app+for+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 10988 bytes
SHA-256: d1b0f6e19db22f7c02797dd6128561cdad03ede938a43c1c8acb5e577e42174f
font_01_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001133a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 18064 bytes
SHA-256: 6638eb5e4f83400da3299b785483780ee20863a9a7d6146b57889c7d750c0637

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