Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d474e46bf9126a6…

MALICIOUS

PDF

73.0 KB Created: 2021-09-15 22:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 98a72d96796fb558ea34cc812ec70322 SHA-1: 891b878a826e12ca9bab8b85c4805268aa298a94 SHA-256: 1d474e46bf9126a6113e493dd1fc3ae3d87832e5b69d7ea96ba246629c8807f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as malicious, including a specific ML classifier and ClamAV detection for phishing and trojan activity. The file functions as a link farm, containing numerous external URIs pointing to disposable hosting, indicating a likely attempt to distribute malware or phish for credentials. The presence of many external links and the nature of the hosting suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://infrive.ru/uplcv?utm_term=jind+meriye+movie PDF link annotation
    • http://nova-auto.com/upload/32404889552.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/66554819464.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/relivabob.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/11765684634.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/14/kiruguderoju.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/xulame.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kububepeken.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9a3db893---90557810994.pdfIn PDF document text
    • http://tercovci.cz/files/file/89300334105.pdfIn PDF document text
    • https://noventa.cz/media/files/file/simobafatu.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/fipuvamagujivago.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/66650539458.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/numanomoxopemosepatuzi.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/3100089200.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/bukekopimove.pdfIn PDF document text
    • https://tigapilar.com/upload/files/12289891568.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/patutudedix.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/xudafizalugazazapomunen.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/fejugunanusubep.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/semevadegugozetowekori.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/97002154964.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/jofamokuzofusiwagumopen.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/fexol.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_off0000be5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5E 16208 bytes
SHA-256: 0e0cafcce48eee40984e15a230b1b1a22e99a242991ec250641331cf97ef14e4
font_01_sfnt_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 10108 bytes
SHA-256: 77a12735b31946e079a04d6db481d2e57fc3d12139a22b2010ef936e571ec1b2
font_02_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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