Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7be857dff756bed…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 14:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 955276f6249a06fa34cf8d2e4dbf6452 SHA-1: 3194c281a6e7312f0a6b66d42785e4c6098b5d22 SHA-256: f7be857dff756bed9b73c0538e40c8388ff520fc698ff277079428c1770ad130
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF's structure and embedded content are consistent with a malicious document designed to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://medvor.ru/uplcv?utm_term=mario+world+flash+2 PDF link annotation
    • https://jbdclothiers.net/emailer/userfiles/file/80267308322.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/87351730400.pdfIn PDF document text
    • http://all-premium.com/user_file/files/tinasidekekutu.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/87590881375.pdfIn PDF document text
    • http://labonscafe.com/userfiles/malowerotapozagavo.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/79101691715.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/mefamijotezika.pdfIn PDF document text
    • http://poiskvod.ru/images/file/45864656140.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210910_2B12B26B611978A3.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/rugadijidebovikopep.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/gawogagalisopujamaleji.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/riwobolikolapifumezofeki.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/76400345685.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/ritujevexosuderib.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a738fc7760---bimuliguvoguteki.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3681cf40c5035c09aa7508879e1ed561/tuvomopolovimetifus.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/kokadamofowijunilivagufa.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/lezex.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/18721683575.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/jilokozorovamido.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/91760400610.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/dafegugu.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_off0000bac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC0 10316 bytes
SHA-256: 5ba136954f07ed975900db741a204c7fca88cd86347f4728c83b093f5313b29a
font_01_sfnt_off0000d22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 16964 bytes
SHA-256: 8318e3ef20aaffd33848cda13d879781155a52b86e33bea976606d2e11f32af6
font_02_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1