Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ec6e23fd4ad038…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 08:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 010b21bf444c17e7c617f4e3edfef9d1 SHA-1: 781e303e9b7ff229bc67118a28735f037881f0a6 SHA-256: e8ec6e23fd4ad03896d6383d9f43414a152bd5f275ae6f7f872cfdcbea8a4462
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=best+free+live+iptv+for+firestick PDF link annotation
    • http://micronforgacsolo.hu/UserFiles/file/supunuvuwogevugaxasiwo.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/zowaxikeni.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109260700446269.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/85162917849.pdfIn PDF document text
    • https://wasael.com/userfiles/file/83413676348.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/29868539671.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/kerepuralukilulunado.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/motega.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2dc890f64---49634367462.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/fogozuliruwo.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/26370172105.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/vevurot.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/32673621815.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/j3ao18stfbont1mh8mu8run53h/naxawodifipidokotovazum.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/78292503488.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/fepipebifiwogonefifada.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/83515184323.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/zigirabofipemumesidumat.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/59830691887.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/wewikodidorubon.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/dumuvegifutalusizosuze.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/muxenezojanutadekogajog.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/13610189972.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jibomenewatapez.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/8568856170.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/zupesinuxolugokofi.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_off0000b0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C3 10416 bytes
SHA-256: 8cc758baac62abc6b50f2718ab3668eafc1924d9c6acdedf19b44ea2785872f8
font_01_sfnt_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 14920 bytes
SHA-256: ed3086682f854dfc5472b73b62317288eda981b0cc7798b61a5dd8658a16f926