Malicious PDF — malware analysis report

Static analysis result for SHA-256 19daae9dbcdc22de…

MALICIOUS

PDF

87.9 KB Created: 2021-09-16 18:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8030d315ab9ec3df54fd429cd1484be0 SHA-1: ea74d72523c5e1ec5f2c1ca51a749c0021b121a3 SHA-256: 19daae9dbcdc22dec10d3382a404139dd600179dfda13313291e0fa5b0c308c5
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 a large number of embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=crank+movie+online+watch PDF link annotation
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/vazeluvulixufurerexoku.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/rizaravawi.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/zugifowexisofevegevuxo.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/tuvijuteto.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/zugap.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/dunoko.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/vokapazuzivek.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/79316888566.pdfIn PDF document text
    • http://www.moyekolodin.com/files/nesegasokem.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/pixorerut.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/gomogowa.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109021047386369.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/xizasimosametejiramamiwi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613985ead91ef---pirupa.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/7981924397.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/resite.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/32074547158.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/tanen.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/tilad.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/jodokotivorovo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133964f5358b---fisud.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/32104058434.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/bewuka.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/6494508890.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_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 10600 bytes
SHA-256: 06f0f777a3a80ca0174b88c083e2ee60ebcd7833084b7f5efb578829b006d812
font_02_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 17596 bytes
SHA-256: e2f740a423545e7f56a16cf85803487ad493d3ac290675ae9dd503116d4e898a

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