Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1275e6f6a078c92…

MALICIOUS

PDF

69.0 KB Created: 2021-09-18 21:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c27223414749664b27cc3e0e45dacb20 SHA-1: a45ab72b8bc376c85e4e2090b170455e7bc267b9 SHA-256: b1275e6f6a078c92b57367cf5f0d9b2f76d76e18f89f6148976bd68aa585c6d5
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 structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://abwbaltimore.com/uploads/files/94236071175.pdf In PDF document text
    • https://contabil-fiscal.ro/mm/file/dorukop.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wenexogusomix.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/38973437206.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/59194184935.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/zuranisokiwi.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/65463750509.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/29298640516.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/21627449303.pdfIn PDF document text
    • http://househouse.it/userfiles/files/30305900331.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/zodusoxetoromexunoxegi.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///28168951031.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/18991852280.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/ranifojifalozitejularifez.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/15078963503.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/11577652567.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/16296174741.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/99983101720.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/devebodidodelofovawibog.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/21379817759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=biggest+mobile+mmorpgPDF 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_off0000ae32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE32 10524 bytes
SHA-256: 490159eea58a9b24f1f5dcc9a25e8397ff19b2a6121c7ec9154ef3551e38608f
font_01_sfnt_off0000c5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F3 15940 bytes
SHA-256: fec7050a5938e15389d46e7db54fe2dae9eadf211e57c3446914179f81fb9fa4
font_02_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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