Malicious PDF — malware analysis report

Static analysis result for SHA-256 3becf037e0a63789…

MALICIOUS

PDF

84.7 KB Created: 2021-10-06 02:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0244f5ac8c80459bce9dce17412686b5 SHA-1: 3a541345d0cc955c02e7a4dfa3df118b1895e826 SHA-256: 3becf037e0a637898a3fda2c234077164cf0a5b128a2827a4a647e0c40d936e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=bhal+and+arun+bahl+organic+chemistry PDF link annotation
    • http://hyosangjo.com/userfiles/file/20210926072914.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210924_1164D4DDFFCD3969.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/24833549904.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/nasemenafuzizobamoxo.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/2641485780.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/fasopexuve.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vjstuu4eilc0o31kes66o4mg4r/19800210486.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/rixebonuwodiroku.pdfIn PDF document text
    • https://theipbuzz.com/images/file/51410232468.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346dddaa5dd---81769089463.pdfIn PDF document text
    • http://anm-av.de/uploads/files/runaxitugumejases.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/10381501639.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/jegedogowop.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/89020985607.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/70295201954.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/88019912274.pdfIn PDF document text
    • http://knipia.com/userfiles/file/kilugufisizotufopekap.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/xunilo.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/vibeserapov.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/40294246844.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/1022103416.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/pawilopisotu.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/10173067406.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/67617088665.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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 20348 bytes
SHA-256: 8cd03724f40fd51151f64e5eafb83f57cfadc26d721d148e88154986cb5d5fad
font_01_sfnt_off000112d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D3 11224 bytes
SHA-256: d677c58d28b47af64c651bb13de08cd03a271467c5828c64d9433c9c13572ecc
font_02_sfnt_off00012cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1