Malicious PDF — malware analysis report

Static analysis result for SHA-256 0258f87e0476f644…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 10:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3f942dfcc7958640ec48b33da3c41c8 SHA-1: 295cfe916cdac9f5606806e75c3877bc95eba694 SHA-256: 0258f87e0476f644c48162a5dcc4210b2c8c83b1661f32b7cdb86eddbbf5d2b3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URLs suggests the PDF is designed to either phish for credentials or download a secondary payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the URLs are part of a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=the+first+government+of+the+united+states+was+the PDF link annotation
    • http://anhuizhkj.com/upload_fck/file/2021-9-1/20210901132749719463.pdfIn PDF document text
    • https://flomogroup.com/upload/files/29869916639.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/22383649730.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/gizinupimiridafos.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210910105232.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/xelugoselezum.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/68990723119.pdfIn PDF document text
    • https://domilot.com/uploader/files/82599667121.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/44228844327.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/juzozot.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/vuruwefezefego.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/gopanilibufikufomodeb.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/fevawibaworupazutux.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/fotubuvabexuvopapipudavum.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/xeralakuvovarifaba.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/juvigesikasawalo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vedafizetibidowowopefim.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/94255276831.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/zafafetekufoludoviwefase.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/39808581637.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/18353477128.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130783e5987b---87190098966.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://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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 10968 bytes
SHA-256: 0b8824d71a2757ae358a4ac4d082fdd135e13f72e96e1bca1e4e1c4a353b8166
font_02_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 21448 bytes
SHA-256: dbbf70e5bc3eee24fb0d4e92ce7c754e0f5b0dcc045a460efa3ef6f7b4e9ec7d

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