Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fc4062ef7e4fb5…

MALICIOUS

PDF

77.8 KB Created: 2021-09-23 08:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fccd0e263e7cbd703887283d2ccb8955 SHA-1: ad5bc377a510d38abf5f076f8a26c3d92c961a0f SHA-256: c9fc4062ef7e4fb5b3c660200d3730f609d1d192fe9af1006cf36d1599257505
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://parvazyab.net/basefile/api203/files/kotisexugepipo.pdf In PDF document text
    • http://annamsaigonlaw.com/upload/files/9803287554.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/91478753329.pdfIn PDF document text
    • http://nincity.de/inline/file/makuzarol.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/22726960806.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/mujuzamikogeparikat.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/tiwezozi.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/gosasonagidamum.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/21/surozuraxoliredog.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcfb2a202e---25487641765.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/lonasegixe.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614139f56085e---lazosodupirimali.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/moxanatubogifuvedazigeda.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jilelejuwotosip.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/55195516508.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16133481472945---52213814893.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/zuladafo.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/20589058825.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/95365895567.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/sesesipubarurofor.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/80447514356.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/mifuja.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/zutixagoxakagilapunipij.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/kezitemixakubexamewemuk.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/25081565376.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/logupewefatoxiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+manual+backupPDF 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_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 10592 bytes
SHA-256: 9654f0a2f3add52298fd8204267dd75e6a90cb82215e66b42ab077679286602e
font_01_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 16912 bytes
SHA-256: 3319d0b726b65133af8971f3c0a719f8691e55e380214934e1b8b6d8ae0fc67b
font_02_sfnt_off000111c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1