Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b761b78b26107b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 09:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e5bac757bb2b19c09c6b8bfe5bc9bf5 SHA-1: 4b7e99a32d5bfb126453a90a185cf8569150b0a1 SHA-256: f1b761b78b26107b0477e06dc0e673bd82e9553ff09851cce01beaa55c344445
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one specifically pointing to a URL that appears to be a redirector for phishing or malware delivery. The PDF structure and the presence of embedded links suggest it is used as a lure to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=setup+godaddy+email+on+android+phone PDF link annotation
    • https://mamadona.ru/ckfinder/userfiles/files/nexajafabanifoxuxoxus.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/betituje.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/34c85a2d9f18b5be53b7717623b7a7ce/40329008187.pdfIn PDF document text
    • https://webrobogo.hu/kepek/xuxomowefazile.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/29009848188.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec07582ac0---39817130219.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/vatoguzowovinobebifozobo.pdfIn PDF document text
    • https://servauto.fr/img/user/file/58566461420.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/gogipokifivuwoguxok.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/41767685374.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/32011994288.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/majekunezuv.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/17830862075.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/dodufuzagugo.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/48100227254.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/baxifi.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/zosif.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/vufowepavoriwudiketovuji.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/xetulodutinupumowiju.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/13673903216.pdfIn PDF document text
    • http://csp.hu/editor_up/97747149130.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/vusoxabekolupopoponu.pdfIn PDF document text
    • https://phr4u.com/files/xuziwozopirubenisitetez.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/41463348302.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/jewinudoridaf.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_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 17776 bytes
SHA-256: ae9bb9412efa79052b2a1a14ec7a6ca8b601eeac4310bd134ab4ca278d9c492a
font_01_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 10960 bytes
SHA-256: ef6ff8d688b44f918f09b1714c16bffe75554f4b6dc322c10705d75a2077f58a

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