Malicious PDF — malware analysis report

Static analysis result for SHA-256 6140717e2c92b772…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 11:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63edbb3e70aaadf2316241391da2aeca SHA-1: 0c0b66d15a8664d24d2ba23069d920a3ad334af0 SHA-256: 6140717e2c92b77267e68fe70842b7648721956215f5ba3f9df96c034cbc3dff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 hosting and appear to be part of a link farm. The primary function seems to be redirecting users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=how+to+block+my+phone+number+on+android PDF link annotation
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/roxogituwudawuvi.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/57430914149.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/75120242718.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210902160652.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/3554577699.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/93476048305.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/voxofefuwuruwegotami.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/62843941891.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/28044360366.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/kimen.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/56677941659.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/16134844907.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a05f422fff---pewipogosovat.pdfIn PDF document text
    • http://ipublicity.cz/data/file/52173290744.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/tokajovuwuzi.pdfIn PDF document text
    • http://pvvc.cz/files/pavudafotuvipixagukipamu.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xogasizikazix.pdfIn PDF document text
    • http://tai-group.com/upload/files/25232350012.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/palojibinu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613429581adde---zaxamanoreregomapur.pdfIn PDF document text
    • http://asoriofrio.org/ckfinder/userfiles/files/mafolidoz.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/76536953942.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_off0000db1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 17788 bytes
SHA-256: 7bd896eb97f0335fc79c8ecb33b939149bd356fc013565cd47030dcff76a669c
font_01_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 11132 bytes
SHA-256: f29ce1298b51de8f8fc2b5b506626719d9e7b430100bab5a747192dc76868506

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