Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeec8da2e8504100…

MALICIOUS

PDF

74.9 KB Created: 2021-09-29 00:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f88fd0dd64a8f288a437504f90129bc3 SHA-1: ed9c02a088075baf20e7ae75a9d2f6dc4f5050c1 SHA-256: aeec8da2e8504100009d0da9194cdb0bcc2c67eae6d481c7c92c733b6c121510
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous external URIs on disposable domains, such as https://allytemp.ru/uplcv?utm_term=galaxy+note+3+android+7. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

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 https://allytemp.ru/uplcv?utm_term=galaxy+note+3+android+7
    • https://grdr.org/paidel/ckfinder/userfiles/files/xukigogamevavetonuzoxo.pdf
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/9504755097.pdf
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/99493172631.pdf
    • http://kubablimel.pl/Image/files/xolilewobomu.pdf
    • http://casier-a-bouteilles.fr/file/14635835883.pdf
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/12960267670.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/liwatuxaga.pdf
    • http://spec-so.ru/sites/default/files/file/93807508150.pdf
    • https://datawire.gr/files/files/puridikiz.pdf
    • http://evevoyance.fr/adh/.-/file/gotosoxaga.pdf
    • http://tongchangkj.com/uploadfile/file///2021091222255950.pdf
    • http://jonme.net/ckupload/files/namugatuvifumojatakepesif.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/01a2702e9a1643d2c0c659d9021e03d2/lifesulizogo.pdf
    • https://takipcisec.com/calisma2/files/uploads/38994325965.pdf
    • http://bloemenwinkelindex.nl/images/uploads/kakosexasuvutukilum.pdf
    • http://pepinieres-soupe.com/userfiles/file/majiligalegevejagemik.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d2121ea98---20283713336.pdf
    • https://dgssu.com/upfolder/e/files/20210929051126.pdf
    • http://cafegreenwichvillage.com/uploads/files/33169868529.pdf
    • http://dglytbt.com/upfolder/e/files/20210918225343.pdf
    • https://phatgiaolongan.com/upload/ckupload/files/60025981930.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/40061725235.pdf
    • http://cncsprings.com/d/files/84328603478.pdf
    • https://rockyhotelsgroup.com/uploaded/files/putipopizeniwa.pdf
    • https://sgotomotiv.org/upload/files/51792309437.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_off0000bc59.bin
ea5f8da750905e2ba4cba76f0c4d8e5bde3a5555807e8cfdae2f2733d2aade3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC59 19056 bytes
font_01_sfnt_off0000ee00.bin
00bbcba6dcaba83f7b82eb63d313c99e13890c9b43888beeb3780364458f474e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 10552 bytes
font_02_sfnt_off00010655.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 16792 bytes

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