Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9313d740c63a03…

MALICIOUS

PDF

70.6 KB Created: 2021-10-04 00:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bd73aba7ab0d6c5a6c0892d1c16056a8 SHA-1: e5f11f38c249550b7d4532cfc2be0ec1a04a50db SHA-256: 5e9313d740c63a03e143eec340939a047d07e1f7abed54d5af6fee969d68e6f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious PDF files hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6b127ce60544993d6e1bd4108f764c72/limeviguxupasamiju.pdf In PDF document text
    • http://zzzwchem.com/upload/files/tebojenapomibuluwipo.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/temazomizidiv.pdfIn PDF document text
    • https://dernek.daynexdemo.tk/upload/ckfinder/files/11811675097.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/60194291667.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/kotuwiluneguletegapix.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495ae48446d---votopuzajabikubegexabowo.pdfIn PDF document text
    • http://trivio.it/userfiles/files/mogotifab.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/bofirigijavitulifewelad.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/30112272563.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/jibowibizezi.pdfIn PDF document text
    • https://netlandschool.cl/files/jaxakejux.pdfIn PDF document text
    • http://methese.com/upload/files/sobezixo.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/rojazap.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/sewuxorutumilopukeximu.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/84065820221.pdfIn PDF document text
    • http://linza-market.ru/upload/files/5140477918.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/43792026999.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/35650933409.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/judutajojowokugamu.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/34916504815.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/89878015481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=top+performing+reitsPDF 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_off0000b1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EF 10456 bytes
SHA-256: c95f1910e80ea30f41a1fc32c51f6e89984842c4729387d3719028da1fd740ef
font_01_sfnt_off0000c9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 16636 bytes
SHA-256: b32cec7cbef6c8771b96915849ac8697f0cf5084a2a8e04e27d96d515d7e22ac

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