Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c23dd0c709708b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-19 13:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 075c3f344767809cc45357a96d3c62e6 SHA-1: d5d3efe362346e1e46ba0f0c1bd032bef2f9aca4 SHA-256: e8c23dd0c709708b7798bdadbec2fd3f0d81b918391242b7b14a9a6ef131727c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://eurolocal.info/sites/default/files/images/file/finijiwepotugezerefi.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/29cc79df09da0ad9a62e8bbaec4ac4d3/87528413459.pdf
    • https://udruga-invalida.hr/files/zasiligawugijelu.pdf
    • http://jjmcp.jp/userfiles/Image/file/sixibafiwedopozux.pdf
    • http://ingmontagna.com/userfiles/files/91109093109.pdf
    • http://wib24-admin.de/uploads/file/27916506829.pdf
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109190905247898.pdf
    • https://foodexgida.com/uploads/files/poweporakupanoza.pdf
    • http://mtkshop.com/images/uploads/file/mosabawuzavafe.pdf
    • http://tt-ural.su/admin/ckfinder/userfiles/files/gitilopatidu.pdf
    • https://gameclub.by/uploads/files/korisobodomesebirobul.pdf
    • http://3xlove.com/uploadfile/file/35590869696.pdf
    • http://toflight.mobi/attachment/ckeditor/files/d4cd510e59ca0226f3692eed96a77742.pdf
    • http://come2menorca.com/images/file/14032640988.pdf
    • http://hkwwta.org/userfiles/10461930349.pdf
    • http://dom-2000.ru/ckfinder/userfiles/files/81209998720.pdf
    • https://misbahelmudii.org/ckfinder/userfiles/files/17996375980.pdf
    • https://sma-dfgg.org/site/admin/file/84126885569.pdf
    • https://noticky.net/akce/fotky/file/43932139184.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/79914198388.pdf
    • http://civicwomen.com/ckfiles/files/58972646748.pdf
    • https://kapefashion.com/files/files/ruforetejap.pdf
    • http://firsttimehomebuyerstudy.com/images/file/velumosavujaruwigonaxepus.pdf
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/popofa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=a+vowel+words
    • 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_off0000b059.bin
d5892edd38283151fad4905b94314292bec1b84ad4575fe9bf7b927f35cbfde1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB059 16184 bytes
font_01_sfnt_off0000d8d1.bin
88f65c26a125fb00d86ed6a061b9ed766908b099ab370dc8c370978300a536e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 9916 bytes
font_02_sfnt_off0000eee9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 16792 bytes

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