Malicious PDF — malware analysis report

Static analysis result for SHA-256 892f86365e892ad3…

MALICIOUS

PDF

70.0 KB Created: 2021-09-14 15:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8ec3ec5adbb7a9e43d458e3c2c3ec48 SHA-1: 72b94631c1b1c87be3bc5d69e4a14214fa0f8d67 SHA-256: 892f86365e892ad377cec9f9e9f120c028386fe2cf7e0e308d0167213b210a3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or 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 indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=hurawatch+watch+tv+shows PDF link annotation
    • http://mudrberanova.cz/userfiles/file/81884928101.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/79301933585.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/digagadakomunag.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/ridisuvefa.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/69177302581.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/6387623813.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/suvijivitigawepas.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/gaxaralijiriripakupida.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/7988262115.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/29992613889.pdfIn PDF document text
    • http://gibisch.com/files/files/noworipabuk.pdfIn PDF document text
    • https://servicepapik.ro/files/sepomofomiwori.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/wanefisopifudexaxugi.pdfIn PDF document text
    • https://dafelia.com/files/84860535250.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/ruwelixupobofemejo.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/seponifegulifitogu.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/wewijorus.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/zabezomesoruvelawu.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/98946174491.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/dizowiv.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/lofaruwegelixisuve.pdfIn PDF document text
    • http://sentralperdana.com/file/3684557004.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/38030814034.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_off0000b26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7D 16116 bytes
SHA-256: bf0e7df8a98916c63798c61c06373e7d1c2057da5a7e159e7a73dea91d8e5f73
font_02_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 10196 bytes
SHA-256: 5841a4e4814bc0e5673eec6fecd0f047bd6d33779c9e6abf37525668fa076378

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