Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcfd5e499cd3c60…

MALICIOUS

PDF

88.9 KB Created: 2021-09-17 09:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a19c1fb471ede8ae2fa9f541b175b119 SHA-1: 2899646f5670b04eac9d9f7b463d5086ded65901 SHA-256: 4bcfd5e499cd3c609a31fb17a61523b4f7aec810f1605d0befd1d7dbf178a246
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 part of a link farm, indicating a phishing or redirection 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, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ecolservizinettuno.com/userfiles/files/jabiwowotik.pdf
    • http://oppedisanorobertosrl.com/userfiles/files/bugiburu.pdf
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/80881312648.pdf
    • https://digitaldaya.com/imagenes/file/34197987090.pdf
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/61463136881.pdf
    • https://groupburuemas1.com/contents/files/87645294253.pdf
    • http://saimiri.name/upload/file/41588183061.pdf
    • http://yaan121.com/uploads/files/202109011319591716.pdf
    • http://xn--h1aeekk.xn--p1ai/files/file/denumajud.pdf
    • http://chugguwang.com/files/fckeditor/file/28392073273.pdf
    • http://vistobrasil.net/uploads/file/90585977043.pdf
    • http://newgrids.com/userfiles/file/famomedarer.pdf
    • http://koreaticketland.com/userfile/file/82963441259.pdf
    • https://protectname.xyz/whoisprivacy/userfiles/files/64424489958.pdf
    • https://vcubusinesssolutions.com/userfiles/file/xepobulubozofoloj.pdf
    • http://moneymaker-gold.de/files/mokokilur.pdf
    • http://waxiangyuan.com/upload_fck/file/2021-9-5/20210905082321476931.pdf
    • http://palestraarkadia.it/userfiles/files/92460083449.pdf
    • https://obermeyer-modemarkt.de/upload/file/bekoxabixab.pdf
    • http://kleinschaden.expert/userfiles/file/digegamiwakorukuxilemupi.pdf
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26997179296.pdf
    • https://nezrenweb.com/calisma2/files/uploads/relisagamogatorasen.pdf
    • http://kartelabasligi.com/images_upload/files/jawumozofabezugurekoju.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1984bd5e4---95850627222.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+maharshi+movie
    • 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_off0000f90f.bin
8da59dc8a26c908c4dc6d115b30c83735e1f79fb0dfbf17a855d85490bd44282		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 10404 bytes
font_01_sfnt_off000110b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B6 16792 bytes
font_02_sfnt_off000128c8.bin
a515e47f3459a16474623418063786be586552d5762ffb048227bb2c26df7a0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 17812 bytes

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