Malicious PDF — malware analysis report

Static analysis result for SHA-256 14dac06515a3280e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 02:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 52dde0af0e2bacefe42295683fdd3b61 SHA-1: 963b3ccb34e969ce0c496869946ffd72d98e6cb8 SHA-256: 14dac06515a3280e4243cd88f3627ce54089872b1467964925201556288aa81c
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm. One heuristic specifically identified the PDF as a 'disposable link farm on disposable hosting', suggesting a tactic to manipulate search engine results or distribute malicious files. The presence of many unknown reputation URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.ctnphrae.com/ckfinder/userfiles/files/dufazotedovupu.pdf In PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/68342458910.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/dosupore.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/90053216060.pdfIn PDF document text
    • http://floramarble.com/uploads/15154081169.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/60050014586.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109090431415240.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/vawogesiden.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/95620277812.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/7c5fefb3c9003bb8a1c5d66d64c90757/47219139192.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/tinikibamoderixavev.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109131430117920.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/pofevo.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/wekeximobepute.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/6475988564.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/11036719886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=arguably+essays+by+christopher+hitchens+pdfPDF 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_off0000d6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 18864 bytes
SHA-256: 5741b0e1382011997a9c597f63c7db7f1eccc31072e764e691cbffef6988051b
font_01_sfnt_off00010835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10835 11232 bytes
SHA-256: a24f2a3b87c5cea64306dbc3bd7c671fe14fe9f9893fdbd3f0c5baeba8c88a5b
font_02_sfnt_off0001221b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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