Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b9c557e657b6a0…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 09:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4806f0926e1670a3b355868fdb6b3bc SHA-1: ee817dbd5c2305512d14b343048e4f9784d2179f SHA-256: b9b9c557e657b6a0f0774f8cc7d33422563a719cb28435657f507a67b2ef6d7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further suggests a link farm designed for malicious purposes, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://autohondl.cz/userfiles/file/xudiwonizuv.pdf In PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/64997982181.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613170c646c88---ruxusakujil.pdfIn PDF document text
    • http://agilesolutions.in/uploads/lasonexamo.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/46801213575.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/zekariro.pdfIn PDF document text
    • http://cochemical.com/upload/files/48282862947.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/42733460333.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/kititegu.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/titunobafusekofedasafix.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/fejev.pdfIn PDF document text
    • https://eclearusa.com/images/file/fawoxonanewuwaviva.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/tamiwalajupuxe.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/tiguliduvafexubuvuw.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090314474942.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/zaxefugesobiko.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/58545061937.pdfIn PDF document text
    • https://brakos.it/file/1748964026.pdfIn PDF document text
    • http://mextro.de/upload/files/46959526630.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/17653843635.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/85514280178.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/falifemonidigez.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/931fbc458db8bdf78019a0e2adeaa8d0/zirenekuputi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+folder+customizationPDF 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_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 18920 bytes
SHA-256: 67acd1a8ffb49d104b291048c6ffbf255dd7491b348d5762d0668981433f1443
font_01_sfnt_off00011c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C60 10780 bytes
SHA-256: 9b4f9e183e0d1965a1f8ed8ad8bc68b954208dd053eb17a0a6c2609dc6b9c5f9
font_02_sfnt_off00013542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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