Malicious PDF — malware analysis report

Static analysis result for SHA-256 8776c3eb0068ee9a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 02:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96d3a96eaf7cc7f1150e79e9d6118be5 SHA-1: 598498709e3d48c6ef314aa24cddbe8e923f3660 SHA-256: 8776c3eb0068ee9aebf63c320d19e999bf44c2a071a33a8603526e2ed6934c35
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm or SEO abuse. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a likely attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://milkexim.ru/imgeditor/file/xexowu.pdf
    • http://familiegravesen.dk/ckfinder/userfiles/files/xaxetajaru.pdf
    • http://bobmeetin.com/media/galleries/files/86064632960.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/wegisugemu.pdf
    • http://greece-ex.com/images/blog/file/24902347153.pdf
    • https://griby.biz/ckfinder/userfiles/files/tasetizovipuwepadolabupo.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/8ebc685f6beaa54df34ebb9aa9e3f320/sobebit.pdf
    • http://consulcongress.it/uploads/assets/file/33809685756.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/dilezu.pdf
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/gumepot.pdf
    • http://cellesekorea.com/ckupload/files/5428637284.pdf
    • https://senegal4d.com/contents/files/10028135297.pdf
    • http://prplus4u.com/ckupload/files/29308109632.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e6e0ea6cfd2e4f33f8a2be4b009f26c7/tadumipope.pdf
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/38206481754.pdf
    • http://mediedil.eu/userfiles/files/rudebizaniwupug.pdf
    • https://samsungdvmklima.com/upload/ckfinder/files/59492761613.pdf
    • http://sys-svinding.dk/userfiles/file/57252257672.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/33233361759.pdf
    • http://dienlanhlongan.com/upload/files/tejilotejujamubexibo.pdf
    • http://eksternest.be/images/file/29065629791.pdf
    • http://autoneza.cz/UserFiles/File/wosogusexisavar.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/vigadipefekomakinexiteb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=enid+blyton+malory+towers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce1.bin
6a4df16d9b75ad1def763206942bb43c560c5aaf7e5fc59ef1b86a63e62f74ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 10980 bytes
font_01_sfnt_off0000f628.bin
b6bc29b0ba6eececcb2bc37f9f82a6a5da68f35b59e22dc5bef3db5a6b1a4ed6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 18316 bytes
font_02_sfnt_off000125e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E0 16792 bytes

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