Malicious PDF — malware analysis report

Static analysis result for SHA-256 941515cc744b2c9f…

MALICIOUS

PDF

88.1 KB Created: 2021-09-13 01:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d960a89b839c23dfb10753f6218da2d5 SHA-1: 9f0c1596cae7253a9568f62296036cc175a30c79 SHA-256: 941515cc744b2c9fb725df1d9fa286bea33518d9d8086e44d73e6f96a2bdbe84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious content or phishing sites. The PDF structure and the presence of external URIs suggest an attempt to exploit users through deceptive links, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://alcoquimicos.com/ckfinder/userfiles/files/fukimunusuruvezizexavoba.pdf In PDF document text
    • http://assushop.com/userfiles/assushop.com/file/bamomubuwufewix.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/71531563490.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/jatupaponidus.pdfIn PDF document text
    • https://tch.lu/files/files/80670895171.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/22898925089.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/73684685605.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/dezekisidezizifomut.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/morojobexovoteviw.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/40260572897.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/64630909319.pdfIn PDF document text
    • http://pk.mo/userfiles/file/74278068938.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161323a3787152---6481377113.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/ligamupaworepodobutix.pdfIn PDF document text
    • https://educhina.mn/editor/files/gekarepapotu.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/gubixiw.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/24592117178.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/25670949637.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f052387c48f768294d6105830237ac35/gesijimivirogun.pdfIn PDF document text
    • https://kar360.com/resimler/files/42460473289.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/luvoda.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/44171232948.pdfIn PDF document text
    • http://sinoorchids.com/image/file/rutaba.pdfIn PDF document text
    • http://csp.hu/editor_up/16975839845.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/jawesarik.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/6016358843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=biology+of+cancer+by+robert+weinberg+pdfPDF 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_off0000f474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF474 17144 bytes
SHA-256: 5da1e46d93b77f9a388a597bf6fbcdc3bca9f49cc713525fe1d935f284c6cf92
font_01_sfnt_off000120c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E0 11020 bytes
SHA-256: 6318c78a6552bde67fccfb541e5a8f75e734cd6ef63916a8acadd3fa02e4a714