Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc154123ad6ff94…

MALICIOUS

PDF

131.3 KB Created: 2021-10-05 13:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dc9f2e75b293e088906d7e43c95a55e5 SHA-1: 080a16e11165e7cd71bfc5f9d33c61d48312754e SHA-256: 1bc154123ad6ff944e9aa52e1b021138e2bf55ba49bc2798e82a7f528c0786dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or link-farming attack pattern. The PDF structure and embedded content are consistent with attempts to disguise malicious links or redirect users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ecohort.info/userfiles/files/xoguwavojofazagofada.pdf In PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5206474128.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/54097759019.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109062046525615.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/vamurenokinixaruwebonaza.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/fasuzalab.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/2445695859.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/85485957661.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/51846587231.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/66958662042.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/rasaxav.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/tagadiwipamapilomijome.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/mezosiditepanipexufe.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/somuko.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/71224cb974c3c1acb7e5de04ef34e96c/kinusexibowezi.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/97298525227.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/gupulupelaxake.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/bapenipidinaxozavevitegof.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/26133723336.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/11485866639.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/39064076507.pdfIn PDF document text
    • http://woykoff.hu/upload/file/37221325198.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/jixipabifefup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=rufous+albinism+picturesPDF 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_off00018f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F6E 10928 bytes
SHA-256: d4a65527785d886076ecad4166412e12ecfbbbb93805bafbc55288df634813f5
font_01_sfnt_off0001a882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C094 24812 bytes
SHA-256: f1e259f581715aa1d500f60b0211ccdb09c4b110233fa0d462bc2cdcd82aa68f