Malicious PDF — malware analysis report

Static analysis result for SHA-256 77973f10c28c294a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-08 13:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 73118bebfe258d3c54ce58c70c77fa73 SHA-1: 4cbad8e82a458870e8295865522d3603c6afb8c8 SHA-256: 77973f10c28c294a0ae67c10cb3f40ace1f86d9746cadb7d011984bcec116377
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://letdentalab.com/img/files/toririxawaxogosegol.pdf In PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/56458112785.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/lokafisewunorufak.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/vudakefur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff51e61c87---91910178595.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/7201367260.pdfIn PDF document text
    • http://fitviewer.de/files/file/44457332517.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/86655223254.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/rijevetekizemafav.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/51041091387.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/72300136799.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/45138817036.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/81985696596.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/33584842683.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/vozunasawezerixuxon.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/26855491243.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/pusuvu.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210906_055102_9695.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/pizatuwatibowowetod.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109050948213654.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/28577020390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pdf+files+download+instead+of+opening+in+browser+chromePDF 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_off0000c88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 11292 bytes
SHA-256: e67f95ee84f4ebc3a5ec053a13d0bbd1082370e7fa7114036de3abf518ffc8f1
font_02_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 17028 bytes
SHA-256: f75e3ee6b59a5f9e04d526446811fdefe13c745a10d8f8fb6733cae8849868d9

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