Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8859501050d69dd…

MALICIOUS

PDF

71.4 KB Created: 2021-09-11 23:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b94449b9e3ec5609b01c13d75b8f302 SHA-1: 56e56d2c43b2d1633bdff88f8e6880dc51a02099 SHA-256: d8859501050d69ddd251a312ece36846865bf09b14dc3857a57f73c0817f25e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a high number of embedded external URIs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, indicating a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=emulatori+android+per+windows+8 PDF link annotation
    • http://oldmotorsclub.com/files/file/xufegoxipunaf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c11bcade---27213418329.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/bubafer.pdfIn PDF document text
    • https://badrivishal.com/media/bitarojifeponemujevomok.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/siramiwe.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/fagudikimupojiz.pdfIn PDF document text
    • https://servicepapik.ro/files/66272249273.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/71081756542.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/jobebozubesabomikudakavud.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/sunovovesikuwanemigeze.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/reninibofaxugevetigin.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/xeloxejemezorigupajumogu.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/jijebupimuwival.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/sefizumezuwumufuvagi.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/63532233235.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/xikomonunitovanifa.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210911110245_bfl6vc.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/danatawuxosakapab.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/vifolibivoma.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/33950807623.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_off0000b3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BB 10932 bytes
SHA-256: 46d884de65edacee6a28cdc9df912ad0dfc679b54a3a7aa691f120318bddbcc4
font_01_sfnt_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 16880 bytes
SHA-256: f8227214a660e3c9e3f4f0fdcbf91578801fdf39351a337e2479f8061b2c193e

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