Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe96875a4fe2d03…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 04:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35f78bbae9c3e62aa31b8a6fa5ec7686 SHA-1: 890372a1cc16e23a2c96185782f270f56489552f SHA-256: 6fe96875a4fe2d03ef8be247d89a5e5362822a0e26104e6110949a68dc02bc16
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 numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://smidgel.ru/uplcv?utm_term=we+tv+app+apk+download PDF link annotation
    • http://tsradviseurs.nl/mailing/images/photo/file/77780419278.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/39535407048.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/rebajiwotawupone.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/15729247935.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/lokinoti.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/54221223265.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/sefevikifajonalenewa.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/75284087183.pdfIn PDF document text
    • http://kisito.com/userfiles/file/36375110884.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/buxidavi.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/14703734390.pdfIn PDF document text
    • http://santabruna.cl/upload/file/sasubolebulisudususit.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/82806956204.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/22252893798.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/81339764678.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/feriregizeka.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/94753539622.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/71279621397.pdfIn PDF document text
    • https://vitanov.rs/files/legajovumokusujinit.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/rilutorinak.pdfIn PDF document text
    • http://jagamimpi.info/contents/files/31263787573.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/5178056463.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b4944563e---bixaderipamolubo.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/2560696009.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/62811054460.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/4565040871.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_off0000c571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 16308 bytes
SHA-256: 37c9e096add191c2a4b181e20459b34708cc7dcdc17912d75a1e4cc7fa80d8a0
font_02_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 10264 bytes
SHA-256: dabb203c5c60d591c7c7c5d5e625d3ac1f0657e36bf0c44b2acbd08dfd0d7d58