Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedbe90802c07e63…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 13:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc617a1a2a6595458b2e62ec4b30c60f SHA-1: 78763ee23d730594d5bd96c6a8277e58dabaeeea SHA-256: fedbe90802c07e63fec680e7f1c871f90952bf53a269c4327254497672ef4a00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://catamma.ru/uplcv?utm_term=yify+torrent+download+movies PDF link annotation
    • http://gucaoyun.com/uploads/file/152353172945.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/87514481279.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/vogosuveladege.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/baf500a83d2bb0ad37b93ab940754ae3/beroruvepitemojorimagav.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/56945443195.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210905_100118_4500.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/tozovawutinunagaj.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/25178285838.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/xutazevizepuvubajule.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/xurarufal.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/fiwinigalomosadetetej.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rqis5gmkuab8v7i2j7no1gabq7/46028316122.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/befezomov.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/golalorodadatetufavixeli.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/47158116103.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/kuxuxinunuwibul.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/74158268694.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/56338143300.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/rabuvabelikewobe.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/sigumedajegekumupufuto.pdfIn PDF document text
    • http://zamgph.com/uploads/file/090508528672.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/19572080003.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/wivinogimakobonekeneni.pdfIn PDF document text
    • http://kdekdyjak.cz/data/353416049.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 10764 bytes
SHA-256: 5b89248fe290723e0eb8c3c9154b3370c587215beff572f2d5bc4166f9653240
font_02_sfnt_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 19588 bytes
SHA-256: 36351752d17c9fa8f022463f2c8d8cf84363c058b4a0ea5cbc240b5d00a31bab

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