Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe17547b5f3ae82d…

MALICIOUS

PDF

89.5 KB Created: 2021-09-10 15:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 038e2036b5469e2ecec5f0818fec0183 SHA-1: fb0d36e261b2c2d85831998bfa5b97e0e546a521 SHA-256: fe17547b5f3ae82db2155da47cc31120252981e6ab248ec50b4bc9b70595d8cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are disguised with 'utm_term' parameters suggesting search result lures. Several of these links point to other PDF files hosted on various domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://stnicholasway.com/userfiles/file/ravesovozazapasororogan.pdf In PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/bututujuxakunafupojalaku.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/77464269453.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/nidewunokewix.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/87076455327.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/wunazarukitoxosa.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ee0ae58af0f59d9bdf99001cbc0d90af/xodoxigo.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/85891907144.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/susejuramogazutatalorer.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/koxixurujar.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/12525583954.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/6403213250.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/62566926915.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/sekipumiwivi.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/satojodofojesikag.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210908202853.pdfIn PDF document text
    • http://risme.vn/files/gufuxobikowopigejovi.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/wesujinamofuxex.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/47626501745.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/xebukusexa.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/81048008207.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/11550045806.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/25021791795.pdfIn PDF document text
    • http://drironcat.com/images/file/nefizivit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=among+us+online+unblocked+no+downloadPDF link annotation
    • 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_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 10916 bytes
SHA-256: 14ad513d7e3f8d74d8a43e0573338aea428cc190b7a3640293a1d81199ca721b
font_01_sfnt_off0001115c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001296e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296E 18204 bytes
SHA-256: a9a5c31fed13c1b4d48ac931bc5ccfb4a464b4affef07269ab4f5e77d6b51114

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