Malicious PDF — malware analysis report

Static analysis result for SHA-256 a335c8e2028082b9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 01:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d41d9da049af738f646a0696037027a SHA-1: ef192ca21c7be6ab1da96c6a91f5eaaa0ca7166a SHA-256: a335c8e2028082b99936a0188b120e71dda555531df633ce5ee396ba55ec3276
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting a phishing or malware distribution lure. The PDF structure and embedded links point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://smidgel.ru/uplcv?utm_term=download+pubg+lite+mobile+versi+terbaru+2020 PDF link annotation
    • https://oferta.lt/i/File/jeralimijusujugetelejarut.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/69287368477.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/51811111873.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/11828906086.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/qs4jrin8l14b3q5qfvcpr7sbh8/42904309022.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/54005424799.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/vugikotigudup.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/vinujekenakapowo.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/70739998297.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/36859849723.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/pukezo.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/83935771401.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/zigatafowogapulaguba.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/zupixujakepanokojiva.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/wagipinaleva.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/65719862237.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/losilibabozedafekivefu.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/26311231717.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/pelixepavawanemesepozevep.pdfIn PDF document text
    • https://pellevah.com/upload/files/todot.pdfIn PDF document text
    • https://kokomanis.com/contents/files/96765904185.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/67817420838.pdfIn PDF document text
    • http://stagticket.com/fck_upload/file/kejizax.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/perununi.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/47984556106.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaeb56e276---tijule.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_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 18564 bytes
SHA-256: 4d0f59e67bd702c0255f8f06ba58294c09ae2a20f05fa225b4bab01d8d113dcf
font_01_sfnt_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 11372 bytes
SHA-256: dbb31538c08efbc3e891e3d644b8d434e0764e18e86253175a110f6abf597269
font_02_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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