Malicious PDF — malware analysis report

Static analysis result for SHA-256 028e00e65e79ee53…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 19:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47672154f88cb272477d1abd56855520 SHA-1: 4c8d80637d9c5c04a5ae8fc4dd2dc8ba6bd94458 SHA-256: 028e00e65e79ee5346ab95ccc7474226578940c30b82b58879b3bd34618b9a9d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable domains, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=unmatched+air+traffic+control+mod+apk+download PDF link annotation
    • http://simonkuehner.de/gfx/userfiles/files/wibadomowuduruku.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/nobonivewoxex.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161387ad7b71ec---mitezamomadajusulema.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/rubezuzobirovu.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/zanabapali.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/36238232556.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161390e87809a5---65064041611.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/zixim.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///50359847014.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xagasaferi.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/bedipidajiwukimokatem.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/12445745020.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/legogeja.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/wesebizaluv.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/69604568447.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210908/1443266979.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/lavut.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/43815623331.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/fobaroluzojatipibevomus.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/xopasel.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/86055634441.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/kutanamapimef.pdfIn PDF document text
    • 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_off0000d3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 10900 bytes
SHA-256: 1fcb601d01596ab70b1a879516f71e5a283ac0b4764e0036a99a18d3a656cf6f
font_02_sfnt_off000104d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D0 18264 bytes
SHA-256: 7589aafafcbd53218de73fc8ba25601211bbec525398cc94ed2ad18a2471e302