Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3480c3ad8a55f5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 16:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 105bbc028ecefe2c1d4f560ce100ac7a SHA-1: ae498b8536cd562a4de9354060005b132cd22111 SHA-256: 1a3480c3ad8a55f59beaed66dcdd102e6e5d0e0ef73e4b0b35f5f446c39e1408
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 indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, hosting a large number of links to distinct, potentially disposable domains. This strongly suggests a phishing or credential harvesting attempt, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.ccs-corporation.com/ckfinder/userfiles/files/38913396171.pdf In PDF document text
    • http://tnslib.su/userfiles/files/veguzures.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/98506651519.pdfIn PDF document text
    • https://aokman-drive.com/d/files/jinax.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/5285268913.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/dazanoner.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/xugodofoxinojeko.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/komibabizidexoli.pdfIn PDF document text
    • http://amkchem.com/upload/files/50240916234.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/borisol.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/80836565474.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/gegufujegegevovavodimiva.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/25279414784.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/zelanividesa.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/liwizib.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/ripinulofitobi.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/84498985526.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/refegomer.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/zuneputajaliwelibaxez.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161379d9584971---patoguzewipenuguwavev.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///70162388309.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/beb2c9b490230094d3ed6c46c56cba08/zititebawobames.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/pumili.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/50655214098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=snow+leopard+life+cycle+diagramPDF 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_off0000dbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 10972 bytes
SHA-256: 45c4e538c7ee9ff87373b54d21392a77f3234190e6c65fa03497e07d36d5eb0c
font_01_sfnt_off0000f530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 17456 bytes
SHA-256: 1b27fd611a9a47f039eea74033d7199707740bafe5664f0a0739d6ed21189dc1

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