Malicious PDF — malware analysis report

Static analysis result for SHA-256 61660c247bf9ffb3…

MALICIOUS

PDF

67.7 KB Created: 2021-09-24 19:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9622e273249da812108ef01dbcbe8e0 SHA-1: 5db7c3a1b27f35660b854915060f2342eae8f193 SHA-256: 61660c247bf9ffb3fdd480f3430ede2df15fe04af5dfcc39112cc71cd675ad18
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, which contains numerous external URLs pointing to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or initiate further downloads. No scripts were extracted, but the PDF structure and URL distribution suggest a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pixomot.ru/uplcv?utm_term=the+11+laws+of+likability+pdf+free+download PDF link annotation
    • http://farmaciafoglia.eu/userfiles/files/wuzuxogukodewusav.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/8316273412.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/92023035993.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/pewidulowumopitafem.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/1224780475.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/jotemivuwemuxe.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/29114203532.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/77635568907.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/momorotukobezamadezatad.pdfIn PDF document text
    • https://mkart.it/uploads/file/tiwigak.pdfIn PDF document text
    • https://totszerdahelyikultura.hu/images/file/85503342773.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/batojeseda.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/40143887638.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210901065504.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/40778a3cf83b32d7428ba59518349231/76153579314.pdfIn PDF document text
    • http://biomehl.com/images/content/files/49260712082.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/fusuketefutipoxaraguxuj.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/xojuger.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210921040246.pdfIn PDF document text
    • http://farmina.ru/uploads/files/53373310380.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/34084845755.pdfIn PDF document text
    • http://berbun.com/user_img/file/54745293519.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/ratunovonuza.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/mapibulejevilodomixib.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_off0000ad35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD35 11040 bytes
SHA-256: 1811a35ae82e4c9dbd370fea119cd8f4a6e86994cea5f335921c0bd858f40131
font_01_sfnt_off0000c6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C3 13860 bytes
SHA-256: 278af82feaea5965955a4a5dedbb877de45cd72d69a9622a2de78e891d753b52
font_02_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1