Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ac8c6b8d2e08c7…

MALICIOUS

PDF

86.1 KB Created: 2021-09-09 01:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 350222ebd5673bff290cb625790f9e32 SHA-1: 6e2d566a928f6752a02882493aefc5e01637fd7f SHA-256: d2ac8c6b8d2e08c7b467f87eaf05ebcf50fa3de667c68c5157bb6fec988d9058
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

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://pyhunlian.com/uploadfile/file/legudaxir.pdf In PDF document text
    • https://zohopin.com/calisma2/files/uploads/timirurozejirugosa.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/nulewalogozuf.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/ronebepinolad.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/7167256174.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/93307004832.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/firadawosalis.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/3927451383.pdfIn PDF document text
    • https://aneri12.eu/res/file/75374804531.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/zureridejanalobifom.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/pezefene.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/31b9c1b74c03a9d7098af736d77f4a7f/wodisufidenixojamutoxun.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/bafin.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/segujaxesizuserebitik.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630920387.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/98089442287.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/72243750684.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/sujib.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/zonepodatotosemu.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/saretokusugasaj.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/rokiv.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/27152389192.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130753192023---tugosakukunurozusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=screen+mirroring+software+for+pc+to+androidPDF 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_off0000e893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 11080 bytes
SHA-256: 33a719e036aee25b9acd4652472c4d51dcdb3687eaec7e4dddefd53b065dfb50
font_01_sfnt_off00010239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 18648 bytes
SHA-256: 913e0fe0947cc4b718c8a651b1853adbce0c080904f749186699eaed64b676fa