Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f8af57ab253641…

MALICIOUS

PDF

87.5 KB Created: 2021-09-11 18:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bbcd3fbe0896c7a967e21d7f1167062 SHA-1: 4d9c56feda1034af3f27cabf82a24410c137f385 SHA-256: 13f8af57ab253641a80a8b1a7eedc692890e8ed1a32bd8e89edf27ba3fe41f3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

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://csn-alliance.com/data/files/38262277488.pdf In PDF document text
    • https://ochronaskory.pl/pliki_user/File/zilebukenokipebivovizi.pdfIn PDF document text
    • https://adikketiga.com/contents/files/pigegowifutofiwedepu.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/wuxekez.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/15002659644.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/78495156586.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/nizizikowevixagalipo.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/logawikowexosisikanoko.pdfIn PDF document text
    • http://bociany.sk/media/file/70090180882.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d2628e25---zabefikorobolopuwit.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/xodaker.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/3628253833.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/14960968788.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/7372759843.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/gafejal.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/pofaz.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/bosuteniteziwizude.pdfIn PDF document text
    • https://5uempat.com/contents/files/78180498999.pdfIn PDF document text
    • http://araonline.hu/uploads/file/96641724636.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/52016228503.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/46235832214.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/tatoruwiw.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6dad02983---42906364071.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/senumefutulavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mi+note+9s+featuresPDF 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_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 16192 bytes
SHA-256: b1b75f668f8bf3084f0ccc6c8536ec91737763dc231e4bbba5a1364e75488624
font_02_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 17860 bytes
SHA-256: a3c94e07b4fcb4fe24c5ee1ec63be2b74ec5c77d07b976fb5799226cfaab1531

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