Malicious PDF — malware analysis report

Static analysis result for SHA-256 552ba08f133ca642…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 12:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33dc2367361c4ff0fa3db3ae9b1252db SHA-1: ee1ef3b196e74980531fe5df6931e8c7d9151670 SHA-256: 552ba08f133ca642f25eb453ba7f62f897af6f6b3aabe158f1ebb6c42529dcd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm on disposable hosting. The PDF contains numerous external URIs, including one pointing to 'smidgel.ru', suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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=what+does+purple+and+orange+make PDF link annotation
    • https://mimpishio2bet.com/contents/files/5532561753.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///lajuropali.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6808a9ede---86998851890.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/40670366534.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/99755020414.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/37336666496.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a75a93f15f75bbe052507907bd2caa03/90561248356.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/6611951247.pdfIn PDF document text
    • https://marosme.ro/hirek/file/77343137536.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/88552243474.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/15167003190.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/nunanakedan.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/33470081053.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/wilifibipuxupeneravitaxi.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/rawelanudobedaze.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630454771/files/vavozusosorediludugolej.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/35838283108.pdfIn PDF document text
    • http://meskerjager.nl/media/files/didesuzaxuxaxusuxu.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/80735649128.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/70119905412.pdfIn PDF document text
    • http://rc-modeller.se/images/file///gilubevuxafadip.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/jilelarozosebapagatonigi.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/fagaxajida.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/fojojodiduferijes.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/movuxinulisuneramiz.pdfIn PDF document text
    • http://mfcpavpos.ru/file/38610377645.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/4874544071.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_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 10932 bytes
SHA-256: 6ed0ffa788f6cc7c720a479e326de466fff53fb333cc406cd54c9d9efd3dda98
font_01_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E78 18016 bytes
SHA-256: 4c0ed71f3ba106a83757ad2df3192b11144d384c20f247d88341029adb14a8c3