Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0b1f9df4219900…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 06:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb20f306343b4d6715cd91bf326a20bd SHA-1: 16d0d80d8e78eeb1a2d0cc7b837c006aed8f6339 SHA-256: 8d0b1f9df4219900cb7c10b1a348c941c913ce6b3ec401ce9b60088370f225bb
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, including one to an algorithmically generated URL. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection or download of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=beauty+plus+apk PDF link annotation
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b25fa205b6d0a21d3c347270822237c9/91522283596.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/pigomepos.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/sonedibixibajuxerogimizi.pdfIn PDF document text
    • https://eetravel.net/file/nefagitujatomozatibokusod.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/35343496503.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/sekagojafomerad.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/45631159090.pdfIn PDF document text
    • https://priscar.com/documents/files/verur.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/65582576480.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/pekozejejurosudok.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/34763820854.pdfIn PDF document text
    • http://web5gstore.com/Files/files/30428943876.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/goxawawemelafatux.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/58900103473.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/87384932303.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/28411693443.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/jisebuxegajuvotowemota.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/23660082602.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1f1057f50---15532478946.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/wusatigeloroxunukaz.pdfIn PDF document text
    • https://eetravel.net/file/93310841292.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/dogufivedivusonofotomigu.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/fuxojoximadajapekiv.pdfIn PDF document text
    • https://renetravel.ro/images/files/niretowapipexogu.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/buvijifalunaxagipirawejo.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/tipomizog.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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 10188 bytes
SHA-256: 45b4361626d71df0479ddf063877bebec01770659a2c0f65002a8f6dcf3a30ad
font_02_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 17084 bytes
SHA-256: a94721c1afccd6db49f50399b879596cc3d3e052b2a222ba07145ff035137454

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