Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40ed53a718cf55e…

MALICIOUS

PDF

88.9 KB Created: 2021-09-14 09:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fbe5c2c057ca5de29362bbae94f7eebe SHA-1: 800be1574c26f6f251144a7b29a6d6b59f8fc0ec SHA-256: d40ed53a718cf55e80d3cd2a7ae0474d32f518dd7559eb2cf105b977eb77c137
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://world-green-hope.com/uploads/files/sadidi.pdf In PDF document text
    • http://vilocom.net/webroot/img/files/97068150211.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/xuralujunotaveretizexi.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/64570458883.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/faverosuvafo.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/2402260914.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/jezakosewatu.pdfIn PDF document text
    • http://weldingplaza.com/files/file/84257325637.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/pijixafuvajepofov.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/razizozewuleni.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/72605180159.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/86227088668.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/40948599416.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/91047985450.pdfIn PDF document text
    • https://stormester.no/files/file/57065594464.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/873550446613399dc38112.pdfIn PDF document text
    • http://hotechike.com/files/files/kinubirot.pdfIn PDF document text
    • http://spakimthi.com/upload/files/lidolomabazij.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/03/katelanivigumoli.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/simaguv.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/41357719973.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vs7dddj9csh6bkkeuvjsbqrg0s/51820272774.pdfIn PDF document text
    • http://awards.nl/img/cms/file/57363719753.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b66edd1b74cea26648c76f1c9ad6ba33/viwejuzuf.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/46330391674.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/sasega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=reinstalar+android+en+tablet+lenovoPDF link annotation
    • 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_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 10492 bytes
SHA-256: 55611f456ca6456eea078c0888b9647ecae735a2e7e47c5a26bf09b6edd78aab
font_01_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 18600 bytes
SHA-256: 7b381bb69c14cd641834b518d03e9ee72877cfdc9640173ffc7b25ffcb2e1733
font_02_sfnt_off00013dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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