Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0c0f7528766e41…

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 19:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 36e06d86d2d7783896450539cf80491c SHA-1: 3dae0f5e3c2a4f246be3789cbfb9935c91f1c21b SHA-256: 8d0c0f7528766e41e3f43c0b45b8b93a6671e293c2e0b7a17a6443540feb0659
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a likely attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sintellect.ru/Repository/file/zelorafomoken.pdf In PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/72507661028.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/2769942933.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/gilojerafuvofabi.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/68039122886.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/34719316201.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/dirojuxudomekomelazel.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210917011330.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/43619753179.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/midejawororan.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/sumatanava.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/lulonol.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/sawemubos.pdfIn PDF document text
    • https://redac.ch/upload/94724923284.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/siriresizuxarimevirututiz.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-22/20210922184919799264.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/nijimu.pdfIn PDF document text
    • http://jsdarvin.com/files/24690609958.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/jisusasebapatev.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/kowedoletosupubis.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210905214842.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/33801220147.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d7771314a8c59c1663ec96a50d8fc4f8/95947009474.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/visaviduditotewuputawadix.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/7993651921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=can+i+scan+multiple+pages+at+oncePDF 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_off0000b0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F7 10748 bytes
SHA-256: 566e460b7e63304027bf3922e9db36a0187d279cee1bc9fad4e4490c0ab4c81b
font_01_sfnt_off0000c9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B2 16376 bytes
SHA-256: 02bc209e6cf7f283b1814ca18c5bef13a5db5ea31acac28180d2e598c5b85f9b
font_02_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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