Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecbc7e558ad8693…

MALICIOUS

PDF

76.7 KB Created: 2021-09-24 22:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 810a4c087e6f892923eaa257a3168d95 SHA-1: 528f860616ab2b7d36e0214b491e8ded8cc43b10 SHA-256: 1ecbc7e558ad869350a384b787de8838f95d62fc31961fe7b60ce4f9b432b657
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, indicating a likely phishing or malware distribution campaign. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic findings strongly suggest a malicious intent to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=exchange+calendar+not+syncing
    • https://micsys.in/userfiles/file/gilipewurej.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8111rpfbjtit2f9lnqq2fsfar0/fanefamojir.pdf
    • http://londonjip.com/userData/board/file/24960967661.pdf
    • http://obras.ru/sites/default/files/uploads/wijisiwofibidolososusogib.pdf
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/45299695384.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/61625874140.pdf
    • http://haiannweb.com/uploads/files/wixenep.pdf
    • http://nincity.de/inline/file/73514204199.pdf
    • https://yingzhaoliuart.com/upload/file/88109992873.pdf
    • http://floralojistik.com/userfiles/file/gemabowaduzaropesalasuf.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2f29fdd3866b4c52dfe8499d52281c70/5824591373.pdf
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/faterukarorasod.pdf
    • https://bankubezpieczen.pl/userfiles/file/binavadogame.pdf
    • http://asbufestival.com/uploads/FCK_files/file/panexuzoxowomanun.pdf
    • http://vindindex.nl/images/uploads/namimezusinemeromunuduwet.pdf
    • https://dodatkireklamowe.pl/web/uploads/files/7519471682.pdf
    • https://tagoproperties.com/ckfinder/userfiles/files/vofalinawabasutufuxinej.pdf
    • http://amidoux-peintures.com/ckfinder/userfiles/files/kimavurobepijelubimire.pdf
    • http://leaders-adv.net/userfiles/file/kekawetapurapag.pdf
    • http://www.polni.si/Images/files/bikawozewabe.pdf
    • http://foodchemsino.com/d/files/famanimosalexax.pdf
    • http://marchmontnews.com/imgs/file/436658283.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_off0000c292.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC292 16792 bytes
font_01_sfnt_off0000daa9.bin
3e8e3ba2a7bc1918ba547a494f248b706015ec4ffe95eeb17ba16b3f856f28f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 10848 bytes
font_02_sfnt_off0000f379.bin
83350bf732b5a588906efdde783f13a93359be92d5dc774f7edd89bac89ba23e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 19068 bytes

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