Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb084f07aaa82a94…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 23:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61a6e1eca5e9fe92053705c055059e8e SHA-1: 61843a0d05381383cfbe336354f8746e394cc181 SHA-256: fb084f07aaa82a94071c285edbac49f37a0708f1dc65631677f2e7b122c7aaa0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to unknown domains, and is flagged as a link farm, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nesemlak.com/test/images/uploads/files/59622342440.pdf
    • http://optykglowacki.pl/obrazki/files/nefer.pdf
    • https://manenshop.com/upload/files/dobopubetewali.pdf
    • http://arqing.es/ckfinder/userfiles/files/19640722975.pdf
    • http://spostojow.pl/userfiles/file/valawikupunukifi.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/xotulewuwow.pdf
    • https://beauty-full.ru/uploads/files/purozonoredi.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c061bcdc52d765a7d1e9e36dfa953d97/gadivunafupexofuxejeva.pdf
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/fogaloxuzavarudipa.pdf
    • http://cana.vn/uploads/userfiles/file/zebunuzapiwabaso.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/vajatefuvusuri.pdf
    • https://aviseco.ro/userfiles/file/4340076054.pdf
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/pomove.pdf
    • http://bpabv.nl/uploadfiles/file/tinakorul.pdf
    • https://cezartravel.hu/userfiles/file/22877586968.pdf
    • https://isleo.com/i_photos/file/geruvuzuretijo.pdf
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/nasezazalarofipivinoni.pdf
    • https://egokituz.eus/files/galeria/files/51291997398.pdf
    • https://gberwanda.com/gbe/useruploads/blogs/files/fixeleva.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/87847225028.pdf
    • https://communeouchamps.fr/userfiles/file/rowemozifobunerumu.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5cab6382acfdf0b3c3c2eea568de1fbc/89664600918.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ronin+the+last+samurai+mod
    • 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_off0000da03.bin
b36843e71a517864150115cc6b8f2fcdd565f271fcacf48270e30511c0dcdae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 17348 bytes
font_01_sfnt_off000106c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 16792 bytes
font_02_sfnt_off00011edd.bin
fc74f2870227a5754fc49e050363efc5d904036547f2f0fe344d938b0b8d8efe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 10660 bytes

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