Malicious PDF — malware analysis report

Static analysis result for SHA-256 9533a7d9527bf29b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 01:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b71bb4d2ad8aaebd7cf01d614af8a543 SHA-1: 8ec5fc31b53989ae20fa400f61f2aa41ad20b4eb SHA-256: 9533a7d9527bf29b945d98d921a191375ca25897dad6f0a8c0ddeb5ffe96e5b6
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 0.9974

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://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/mediga.pdf In PDF document text
    • http://daehnfeldt.com/userfiles/file/30524834120.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/wulos.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/jozipujofiferofabugimimi.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/91396653247.pdfIn PDF document text
    • http://apart1day.ru/file/wukefi.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/nejafotit.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/94928597113.pdfIn PDF document text
    • http://vanhacollection.com/images/files/xeniguxeg.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/60491114645.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/15893931937.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/debinik.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/jopatoleminuxatoli.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/1622026695.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090717001286.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/rirefefopapixid.pdfIn PDF document text
    • https://andhimazhai.com/images/files/74803898559.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/bd92517d54d208b404f145485913fc8b/kuxirabarepixofikapem.pdfIn PDF document text
    • https://777mto.org/contents/files/71641976696.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/jovuzazadelutozorowuz.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/zidedovitipe.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/41406716263.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/xitoreponefojedazifo.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/47758279174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=gta+san+andreas+obb+file+500mbPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 17504 bytes
SHA-256: dd952e2022164f59d630e796211967261ae73f7a88e1d30fd24ee5f372697ec3
font_01_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9B 10952 bytes
SHA-256: acc5bfd3afe61b80680529af38c350e2dafde0e248c265a6a2bf1d6b80040690

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