Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77e6af05db63263…

MALICIOUS

PDF

75.8 KB Created: 2021-09-09 13:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e0d91783bfa9dc07c4b17f263202399 SHA-1: fd498a9d340104ca59606b5fa15b1d46c0241a61 SHA-256: b77e6af05db6326315749324de901a97275d99af2895cf8977ce7efcc8d77ca9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs point towards a spearphishing attachment, a common initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=christmas+songbook+piano+pdf PDF link annotation
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/16819898956.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/52826924783.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/23746270971.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/42432373672.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/nufopopisat.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/85474970181.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/88878585371.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/93208959930.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/bf45063f974108d10978e1071db999e4/sosox.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/lozerepazijewumezom.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/21307229477.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/43070157951.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/jajatifukotugexi.pdfIn PDF document text
    • https://camelcarpet.org/d/files/juwixomudezizen.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/niwofi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/fchajjhcgattna69201hadjv7n/fawukozo.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/50143211297.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/pepoguvimajizepok.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/43149082635.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/rofivofijomazuwu.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/gaxomubozu.pdfIn PDF document text
    • http://cascad-trans.ru/files/firajomumukesazarubaruten.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/xujojumuzefaw.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_off0000c244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 17868 bytes
SHA-256: 78bf4df5386b5ff3153968dcd245be0103af2bbd96ee527fe52cc598f7efb3aa
font_02_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 11032 bytes
SHA-256: 21986344351da4e95cb8a12a71b1b725413b34b8cf06ba3ae4e41e158293a591

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