Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1da418d505f26c…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 19:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5c8d4e9b6eecde4fabbb00db2385d63a SHA-1: c8fd19477d6b8bbb4e2686e5efbc09bb6c58103a SHA-256: df1da418d505f26cc590c76a62ebdee66b8341688c870c5aebcddb748301bd5d
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 domains and are structured as link farms, indicating a likely phishing or malware distribution scheme. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=konglish+hong+kong PDF link annotation
    • http://omni-links.com/images/blog/file/tubut.pdfIn PDF document text
    • http://normel.org/files/upload/file/72187406733.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/zujujimozoreroxe.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/fisakok.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/jevogutoviv.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/57652125146.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/46401942653.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109271058055217.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/vefiradujubanir.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/rorob.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/54512643714.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/489755003.pdfIn PDF document text
    • http://gr-chem.com/upload/files/vidudifufolakesukelapade.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161510ec4e26fc---38541845605.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/bopokitigibesene.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/99519857793.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/11116645058.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/suborid.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/pepukukizojadir.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/78955926765.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/pukedosozopurox.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/52526198598.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/58807430785.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_off0000b0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EA 9976 bytes
SHA-256: 969bd06e741193843db225548956c38b35363d3243cc5f898eaefee8082d90ec
font_01_sfnt_off0000c6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 16460 bytes
SHA-256: cb776dca2758a6c006cf36a4ea4e54437073fd7e0be2e803d97e351b03d01dd8

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