Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad274189b4aec99…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 18:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff418e79f724a04f8378317f1b3932f7 SHA-1: e3ad11af13dc28c8cd940de8ae8a58a627fe6feb SHA-256: 5ad274189b4aec9972cdaa15e95b5d1576218db70b1dec0cc89839ce876f79a0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://foundationkuzmanov.com/files/85544173216.pdf In PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/17676858669.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/duo8fibq3kcracqt4chpc693i5/21266577978.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/lafixuxubopufuwigapumomo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba69635be---vesezu.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/3506589424.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/11174698741.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/93648939510.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///fategupolam.pdfIn PDF document text
    • http://screen.by/images/file/winajapitarewakigajubonat.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/dimotivebodomux.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/riwaxonuwibonu.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/23493716453.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/faxopexepilulojaza.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/88356141469.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/38232842991.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/kefizaxinixumog.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091009364646.pdfIn PDF document text
    • http://effektfilm.de/files/file/xetuxebedatojoli.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109011934086429.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/betumexufejiman.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/42660373799.pdfIn PDF document text
    • http://archbot.pl/files/file/41322758682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=war+full+bollywood+moviePDF 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_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 17212 bytes
SHA-256: f4acd011563320760f0249bc107a97e8f1eae64ecd7764d5f97a667af0a71f99
font_02_sfnt_off000120d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D3 10644 bytes
SHA-256: 1ac45380b54625088f07398fb6340706292f51bdd23f48ad98fd1f0243b4a113