Malicious PDF — malware analysis report

Static analysis result for SHA-256 28402221a1209bad…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 19:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c5d59a2c4eb45ec75464f0d0597ebf1 SHA-1: 029d909646edf5cd805c9397fd87f8f8d95c58e7 SHA-256: 28402221a1209badcd4dcaaa7021f82229272b90b1b12f758c7271b16e834eeb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or 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 embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=positive+words+starting+with+p+to+describe+a+person
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/361b6188d74a87c590ecb246a3a275cd/6888977617.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/48151654073.pdf
    • https://matharu.ae/userfiles/file/64405868975.pdf
    • http://www.pattyn360.com/upload/forum/files/batisati.pdf
    • http://ettermanenterprises.com/ckfinder/userfiles/files/32286842432.pdf
    • http://www.sudaff.com/pics/file/noxatanojukubukawuda.pdf
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/wokukosu.pdf
    • http://embeddedhr.com/ckfinder/userfiles/files/48559196237.pdf
    • http://ashioke.com/images/library/File/96302758236.pdf
    • https://medtek.vn/storage/file/muvovobozakalevaj.pdf
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/lezikadomavitukotegipif.pdf
    • http://stisk.com/file/jukazodepuziz.pdf
    • https://12waktu.com/contents/files/sibafavu.pdf
    • https://grandegroup.net/files/1631930120.pdf
    • http://gndpta.eu/news_objects/files/kesef.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161432bcd6506d---48899963695.pdf
    • http://1night2day.com/ckupload/files/58769800408.pdf
    • https://shopexpert.com/app/webroot/files/userfiles/files/batizubarujozinizud.pdf
    • http://studiodrago.eu/userfiles/files/xupekodosopesejobaxe.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/bekovux.pdf
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/komerazepel.pdf
    • https://songhong-thudo.com/img/files/41073703978.pdf
    • https://alternativecarrepair.com/userfiles/file/sasabuxuxepolutu.pdf
    • http://reicar.dk/userfiles/file/51094635605.pdf
    • http://massimosusto.eu/userfiles/files/98338671064.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be1e.bin
bb9cd04e6270e263f5a50d8f8bd9c88829d4e7b0383add4d853a89bf2e0890fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1E 16972 bytes
font_01_sfnt_off0000ea3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 16792 bytes
font_02_sfnt_off00010254.bin
d452d880e1d5ffada7b9c1acff30701bf12d8efede5fac02db98bc5f095c0e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 11040 bytes

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