Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfbcc084c7fde76…

MALICIOUS

PDF

90.3 KB Created: 2021-09-13 22:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0167702863b302672b89f9d26dc9848e SHA-1: 881e737f87b6684cda7fde1aab328bc1851257b5 SHA-256: 5bfbcc084c7fde76c16807110f8f6a829b05188146cea9c4b50f7ba69e099b60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external URIs and is described as a link farm on disposable hosting, indicating a likely attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics suggest this file is part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://catamma.ru/uplcv?utm_term=adele+when+we+were+young+lyrics+and+chords PDF link annotation
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/vigagobofuliv.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/68097042003.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/jubizapojovivo.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/piriwud.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/gemirik.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/44364142950.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/rizikexiperolu.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/6587557871.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/wobuxutak.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/bivukobalexav.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/reketezuxufogovabo.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/4140917900.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109112346515573.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/92092665959.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/xadubalu.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/72165443835.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/kajiwoj.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/xesopam.pdfIn PDF document text
    • http://podushka.by/files/files/ragudiju.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/zopevatoposa.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/tidalejujavinekavutaw.pdfIn PDF document text
    • https://jobtiara.com/files/files/juvot.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/mazin.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/nimowe.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613832571d907---lobegiz.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/81536514084.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_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 18352 bytes
SHA-256: 4f2a35bfc875cb063cbf199b5b458cbd785209df6e45c481f35ed3e56b5a7d3e
font_01_sfnt_off00012a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14250 10832 bytes
SHA-256: 6cc5f4e45edff3e0e01fbda31001d9fd4e313a71f2f1bbb29b62962542a09fd0

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