Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f457374fafe1d3c…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 22:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9693e9f3f1105ef57f18d52a8c24969 SHA-1: 006879e70bf0da7f21cd540b835b2a83de556d26 SHA-256: 1f457374fafe1d3c4beb6d0bc3769d5c8ceab1439a38b54e68acf4a6ad52af75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, a common tactic for distributing malicious content or conducting phishing. The presence of these links suggests the primary goal is to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://conelser.hu/fck_uploads/file/giwigoxowar.pdf In PDF document text
    • http://modellszerviz.hu/userfiles/file/18815169911.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/tumovijofonawudila.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/vuxutevobevowaku.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/vinenifosedifojijako.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/48304930127.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/natuzolutujizokitiri.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/16510624685.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/32819249922.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f382ec8a34---34926514045.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/46608236198.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/putuzetabajetu.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/kezekijorevetitobejakulon.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/norexatof.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/73773540020.pdfIn PDF document text
    • https://krossi.ru/images/content/files/695679592.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/62591320742.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/nugebu.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/disowavogegu.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/69509677083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=system+storage+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_off0000cacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E1 16792 bytes
SHA-256: ac6ea0d73c31bc987cf5f287af62851c7f26004dd6b78c2e395d2333b47f10f7
font_02_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 10732 bytes
SHA-256: dc160c51bdb0e7ccd9d2a439ef6a42e4d385c3c608c9cfd9a5c010571decc163

Open this report in the interactive analyzer, or submit your own file for analysis.