Malicious PDF — malware analysis report

Static analysis result for SHA-256 d499641920376c2d…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 20:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc787945884ce951e8018a9eb73715ec SHA-1: e84239b667b5a3642dbca0820df95dc81acd860e SHA-256: d499641920376c2dbea19a92d3db0b0783c2bd2e763323e09663a533d7102efd
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document's structure and embedded URLs suggest it is part of a phishing campaign designed to trick users into downloading further malicious content, potentially via a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=pearson+english+pdf+download PDF link annotation
    • https://vanphongphamhienluong.com/upload/files/desenugikufabemizidu.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/3393504108.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/54377691320.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/kunelowumogiguwufame.pdfIn PDF document text
    • https://polandpools.com/contents/files/tiwoxugukerizuwiwepugow.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa877bae6---rogasopifarurosagebugati.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/43012629767.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219310565.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/tomit.pdfIn PDF document text
    • http://only-svet.ru/upload/files/26718809343.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/69505134624.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/35527550309.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/16864870844.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/piwirirefave.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/namasomog.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/xitijusesejibevevujuje.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/34041903872.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/juzexu.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/69819188062.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/mewetef.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/78192891067.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/26490985952.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/bijajozovak.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_off0000c8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 10764 bytes
SHA-256: ad749607543797992bdd1ddb9d5e166546f8b44f89e2df01d9a9efbb1b7190b9
font_02_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 18016 bytes
SHA-256: 9a0583c9eb2e4853cf86fccd321e09af0794bec4b72762e138cb6f292d5a1dee

Open this report in the interactive analyzer, or submit your own file for analysis.