Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48f7c7af54d4983…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 09:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9483ec34d414d603f4d36201de962ca4 SHA-1: 68a9664c056ac247a2a1376b576fc6ffce3388d9 SHA-256: f48f7c7af54d498332d6e0d0d5ac733dd18a218708534b39a368ed970ec17e0e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest an attempt to direct users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 4

  • 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://uchid.com/uploads/file/3522975202.pdf In PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/gesafeju.pdfIn PDF document text
    • http://pi-consulting.ch/download/lumusesalokovojites.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/4675695837.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/melufo.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/57609968962.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614141c6906a4---raxikes.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fb4df045fa244741b0db553cb1547295/99880151369.pdfIn PDF document text
    • http://asustainable.com/global/file/gupudojokedomov.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/16840888426.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/murixevizu.pdfIn PDF document text
    • http://orem.mn/uploads/files/pivikixamodutitudawuwe.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/tupexowo.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/lapugu.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109020821072242.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/85536831038.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/fogokigirexorekexamafoge.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/gadamusiveboxituwakisezuw.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/40507667061.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/86286800088.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/vulimuvawobekibuzokodiv.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109061130359066.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/1844524658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mr+love+queen%27s+choice+mod+apkPDF 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_off0000d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 11112 bytes
SHA-256: 148863e40297542306b240ee0e7caf683238650ad01987581851eba0395ae48d
font_01_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 18736 bytes
SHA-256: 4e33e70f5fa250c93c04db70ad73a21481b5276cf64df40cfc0de1e682939179