Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5c454dcf353480…

MALICIOUS

PDF

94.1 KB Created: 2021-09-13 05:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8def1ed5a89259642a5d581deb1b6b24 SHA-1: 168da939c9e1621a80630da0778781a18c52c7ce SHA-256: 1b5c454dcf35348031e988ca129cec300dfc6a75fbea12e99a1f9095e6720a2a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_RANDOM_URL_LINK' specifically points to a suspicious URL that likely serves a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://venusnvs.com/userfiles/file/22542803061.pdf
    • https://laps.pl/userfiles/file/wawagoda.pdf
    • http://inbiosa.eu/static/cfiles/files/jojebujomujixawom.pdf
    • https://icbacademy.com/upload/files/rovupivizivodamobivelar.pdf
    • http://ibconsulting.it/userfiles/files/31633066916.pdf
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/tewit.pdf
    • http://imobilestore.de/userfiles/file/10233225793.pdf
    • https://jmtours.co/aym_image/files/44547009544.pdf
    • http://huiking.cn/uploads/file/091334362947.pdf
    • http://seteo-dechets.com/images/file/rotewudalaritomuko.pdf
    • http://www.wiz-fac.com/uploadImg/file/60304652027.pdf
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/mosimeji.pdf
    • http://ozdermusavirlik.net/userfiles/file/nurujuxovomoreruvolanu.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc1735fb7---fatunoregamaja.pdf
    • http://roberlo.cz/www/files/file/12569473569.pdf
    • http://terremeraude.com/userfiles/file/gefuki.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/bafezobikokof.pdf
    • https://santaclara.com/wysiwygfiles/file/gomunoxepa.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bde13ad73d---99772260295.pdf
    • http://romanakladatelstvi.cz/userfiles/file/taduv.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/97979592955.pdf
    • http://studiomilano.eu/userfiles/files/rotanufixafelabu.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/lisotivomifawomelaki.pdf
    • https://daaeportrett.no/upload/file/6270491939.pdf
    • http://veterinariomauracotti.it/userfiles/files/nonepefidulotugina.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/70883134279.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+app+for+a+website
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b41.bin
eac90b926521407b166037915ab8452041dbf51fe6326c026760329209d98ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 10652 bytes
font_01_sfnt_off0001239e.bin
50f445d5d7ccbab4cf613b21b226541ce7244a5efbef8bd820a7a6d94b68f9df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1239E 18024 bytes
font_02_sfnt_off0001529c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1529C 16792 bytes

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