Malicious PDF — malware analysis report

Static analysis result for SHA-256 4992684a4c83ff07…

MALICIOUS

PDF

106.1 KB Created: 2021-09-08 23:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c12c66d0cca3ed104b0a204afbf15b60 SHA-1: ca4fb6e10612e6da5823f6e57c771478ee360549 SHA-256: 4992684a4c83ff071b372611416d2eb39fc4327c5ed8f9e092dd7e5a152164af
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, many of which point to suspicious domains and are structured as a link farm, a common tactic for distributing malware or conducting phishing campaigns. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true malicious intent through a large number of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://miryangpension.com/FileData/ckfinder/files/20210906_0C572F0F34C1B443.pdf In PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/28212934726.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/mejowisenugosuwez.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/31613443444.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c01833cfc---zabapafi.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/1974463997.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/92147801604.pdfIn PDF document text
    • https://bauarch.bg/files/52495631635.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202191_231115_933.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/detabozirelekoxe.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/13108933658.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///76355080770.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/bemotimaxavunanujafage.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/juzefowezuteladuv.pdfIn PDF document text
    • https://cardolf.ro/files/78945109616.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/15740840228.pdfIn PDF document text
    • http://garderoba.sk/images/_file/41809658757.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/44395073912.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/jagubofosoz.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/50671971161318ed6895a0.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/53483859190.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/vanozaxedixineleliluxiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=frequency+of+visible+light+in+hzPDF 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_off000138c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000150dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DC 11056 bytes
SHA-256: 15cddb6023339876010d48f66df50dd779b07e79662b8bc09d0752ae6825464c
font_02_sfnt_off00016a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A47 18976 bytes
SHA-256: 70d22e0b692d49a36265a5d029944f879b2355c8ad5688a79ad05d31209ea8bf

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