Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85254e1593fb2a3…

MALICIOUS

PDF

74.1 KB Created: 2021-09-22 12:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b1fe54c486f18969444d24ef326047b4 SHA-1: a2cab6029b3c52927e55dec35987b6f4e9594e74 SHA-256: c85254e1593fb2a3a7256782730980d74d193c20094226bdd2706d756f2f14c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting a phishing or scam lure. The presence of many distinct hosts and links per host, as noted by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, further supports a malicious campaign designed to distribute further payloads or lead users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=junior+english+grammar+pdf PDF link annotation
    • http://www.greenfield-sustainability.com/images/files/nexuxapuz.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/wowegil.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/16021934708.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xowimu.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/lajufisulajibokamowoxipe.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/tazavokora.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/boligal.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/28215520245.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/kotewuzozunaseb.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367b22f34fa---pemukaxuwaxigogonajev.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/zabexikokoromawejore.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/bavaninixusiwuvovatani.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210921120556.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210912170451.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/xuxoraziputululum.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/rufuludijulowegimot.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/tikibis.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/getoveg.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109112133226263.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/3cb232297d022ed95dc16d9a11f4493a/pirugixujajilawipejovuma.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/xepobozusiweb.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/bapiwegegiwuzififilef.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/29635483615.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/jekonarudowagi.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_off0000bc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC18 10940 bytes
SHA-256: fe94558bfcefdd14cab4007917237748d6b6c5d4a9e60bd95364bc54cb6d609e
font_01_sfnt_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 17620 bytes
SHA-256: 776881714c17dfbf54b9aaca82c10a51ccd6be425f1899f341fba523c2992b11