Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b9ca5823755bf2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 07:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 908ddc5372aa205391ea52b43b510841 SHA-1: 72a831b4fe4005d92235b8ec2f36d05a908d737f SHA-256: b6b9ca5823755bf2d325e733969520016e290aefb99f431f9cdc625811cf4176
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://frutapac.es/ckfinder/userfiles/files/bufijufugiti.pdf In PDF document text
    • http://holidayservicemarsala.it/userfiles/files/65310431241.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/87686646934.pdfIn PDF document text
    • http://ux-school.ru/files/files/mubusif.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/jesapojokofotovafofifawu.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/gikozimurufu.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/53090372269.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210907_040629.pdfIn PDF document text
    • http://enewind.com/pliki/file/66875933221.pdfIn PDF document text
    • http://linza-market.ru/upload/files/41597801244.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/63021862969.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/tebidizofudejigitadufob.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/nonemalano.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad681461d7b3859e1008374fccf38066/kewuwopafalumejebaz.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/rokikapewufe.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/remawovuxulu.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/27023353766.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/52543575361.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/zibatifaseburutesixa.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/grmm17k6m240qgul2gai11n2cg/lufimosalana.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/73468629261.pdfIn PDF document text
    • http://mfcpavpos.ru/file/4372091139.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21091320070328849657p4m5hb06ii.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/jonafi.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/neduviz.pdfIn PDF document text
    • http://szpk.hu/_user/file/wepagisuged.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/77592442890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+gradle+taskPDF 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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 18824 bytes
SHA-256: 420dd9f366a68a94f01eb8bfd14dc2f84d3f477ef5626dc20a34cf6653dd49fa
font_02_sfnt_off00012ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA2 10496 bytes
SHA-256: a1051ae7c2d9c02532ee55a07462a29c023231f906d480b739a30b456fb94acc