Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85ab35042fc8921…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 23:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1353a6527f3867d5fb62cf2b52b04c29 SHA-1: b1e2b088c61d15cb487b04f2a8a40421ff6dcf23 SHA-256: f85ab35042fc89217b55a72fb485b83ab7e2b36860a60703ef3cb086473eed86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=adventure+of+link PDF link annotation
    • http://kavtas.com/images_upload/files/tosebenokase.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/newetepejuluwawuboluku.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/nezov.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e5e0c1e7---3480198787.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/nutimifusomuvatusibume.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/1443393904.pdfIn PDF document text
    • https://fivetc.net/uploads/files/togoluki.pdfIn PDF document text
    • http://air-ned.com/uploads/files/gopowozelotonolarik.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/51253829846.pdfIn PDF document text
    • http://midel.me/userfiles/file/70745775371.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/34908522771.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/navekevilisebonepafo.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/sifikitegesigu.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/vilogon.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/179c814d216266ed5fda097acf2f72a3/melokare.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/kutiwabovotixamolumokedi.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/xokugo.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/61870511440.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/kezanubeterikota.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/58517764162.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/64831356993.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/danefibopewibu.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/71829234288.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_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 10256 bytes
SHA-256: 90f0fd2e65ca939631a751e78735682016d164297199fda7caf7e66939b0acf1
font_01_sfnt_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 18984 bytes
SHA-256: 16fa13f9bae361156766617ffff2dac2edbbd23bbfb89ee7ffeda4ec7af9dfe4
font_02_sfnt_off00012b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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