Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb4dd255486df4d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-11 02:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 4bb080aae4111225d4526729efbb2984 SHA-1: c014b305dd01ebebfb87d665137b60d17aa351ff SHA-256: 5fb4dd255486df4d6267fb438faf317ddfde7e37fb581e1f394cf5d069a3d3e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://catamma.ru/uplcv?utm_term=last+day+on+earth+survival+mod+money PDF link annotation
    • http://klccpa.com/userfiles/file/kewixezeramotesasewo.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///65758925329.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/zaken.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/rojemigonepezuwerega.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/fikuni.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/rupugenega.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/mifuvutuwitimite.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/kolosuvitif.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/58946202741.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210904053405.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/padezowaregozikigi.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/ziboxizavaguwagigamedu.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090322515820.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/9065177159.pdfIn PDF document text
    • http://gnox.vn/upload/files/55060557065.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/gabegidex.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/lusurupukijoxagozir.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/25771556350.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/kujadudewazarasarebotofe.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/xebasugitifupadalunag.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/tafenewimepoganafer.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/20061003159.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/pizokir.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_off0000b5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BC 14932 bytes
SHA-256: 0a8e36010ba2e32d5881547315ad3b174f483e1d3c5b9c8f018d4731a462a79c
font_01_sfnt_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 10752 bytes
SHA-256: a5c1b13afe66dea553aa5c138ada7425d99a6608b58be905f9af97ea28528cc4

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