Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26617aac7eb7fa4…

MALICIOUS

PDF

97.4 KB Created: 2021-09-11 08:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8a403aa485c62fc6ab4b87a18e892e8 SHA-1: 13643bb353ba596b11e97ae60bcf0bba7f33ba3d SHA-256: a26617aac7eb7fa4ae1e1dea592b709a6772d8ea10efc58a7a6c289e7972b1a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://meritumptt.pl/dokumenty/file/823314839.pdf In PDF document text
    • http://foto-recepty.sk/images/fotky/bamazukuwaramubedat.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631235632.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/xoratezuponutuw.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/61915167532.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/wemagilolenukalerukod.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/24542083710.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/40938901929.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/36962357549.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/soromuribet.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/54564572312.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/budebovizugeguze.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/beziron.pdfIn PDF document text
    • http://labonscafe.com/userfiles/kinizak.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/49277403508.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/38353196869.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/zivukus.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/37888646356.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910234748696.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/tevaxekamilebiki.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/98471625192.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/jezakolujenudij.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109022004131294.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/vegakutore.pdfIn PDF document text
    • https://kar360.com/resimler/files/48876909018.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/72869358488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fast+and+furious+free+streamPDF link annotation
    • 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_off00011458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6A 19692 bytes
SHA-256: 1e6fbb9cb3d619963f1dba25a536c9ca1dfe8db75e96343ee4f511fb0f71bc90
font_02_sfnt_off00015fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB9 10544 bytes
SHA-256: 4df54f91a38ccbad751c41279323b5aea6a4e906f557695242977ed897340347