Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83a30916fd12698…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 12:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6fb0e506affb02aa232d2bca950ebfe2 SHA-1: d10cf1f53e2812fe122d2f9a6a371ee7b33b9928 SHA-256: a83a30916fd126987666fcd18cd3580e8324cde6b4c498e5b56adb6b235d419e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=nsp+emulator+android PDF link annotation
    • https://robertbah.si/files/file/wokebol.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/11664188781.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/54672724876.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-17/20210917075924493731.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/tufinajilesiruwojigu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/f479osrd09jso7651jb4m9tope/xijuzibitamokewoj.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/18833848193.pdfIn PDF document text
    • http://melvin.cz/data/39150307999.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/26902854445.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/42040421898.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/kemijulabulumejuw.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/zepubezutasumozarewisokuv.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/zidajokox.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/75931976318.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/potavumugudu.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/87127148217.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-5/20210905164852191107.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/liral.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/vamizipomabezaba.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161392fb2d98bd---27498740874.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/bugofituvebuxatiwagas.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/guxafanufabukefubeki.pdfIn PDF document text
    • https://citronel.com/userfiles/files/witis.pdfIn PDF document text
    • https://mytopics.it/uploads/file/31697679798.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/riwowebefenejikabon.pdfIn PDF document text
    • 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_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 18336 bytes
SHA-256: 28c63e42f985f353f9861997c4c7d1b4b142c82770736e3e9ee820ca9b02adc9
font_01_sfnt_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001281f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281F 10632 bytes
SHA-256: 3d8ea9ba3d2dfac46ceb4ac804eb8300075062e3f5d7d8ad1c793ccc060bf86b