Malicious PDF — malware analysis report

Static analysis result for SHA-256 621df2e1203092c9…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 16:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c292fb2b69c78f54d159d746dbcbdede SHA-1: ad5fe91557a59d149bc904bb9850f7272ad08591 SHA-256: 621df2e1203092c941fb723c2c56b399dda30a6da2555d2849beebebd98fabf8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are part of a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8791

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://pixomot.ru/uplcv?utm_term=terraria+mobile+latest+version+apk PDF link annotation
    • http://yokosohk.com/files/fckfiles/file/gesupanebamasejiterex.pdfIn PDF document text
    • https://phnews.ro/files/file/93130735327.pdfIn PDF document text
    • http://ossokahve.com/upload/file/nadifinolujakazeduvadazej.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/depum.pdfIn PDF document text
    • https://costarica4d.com/contents/files/61338399461.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614395c9e6de0---mekepatunofukegovurevi.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/21730721215.pdfIn PDF document text
    • https://riwg.in/userfiles/file/33085329935.pdfIn PDF document text
    • http://vodnik48.ru/content/file/24121249949.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/60450252598.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/21326060935.pdfIn PDF document text
    • http://gerocuki.hu/user/file/zedowexulo.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/16431652902.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/81166382894.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/suves.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161444e6807c8c---wurewijezefizatebozurir.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/tolimoketedepozuj.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/feresuterepufusopomebim.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/21420140493.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/4933121414.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/fegej.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/kexowalemufe.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/gunazeviralarifovadoku.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/gobowezokuxamerusinem.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/lezutu.pdfIn 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_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 18524 bytes
SHA-256: e940e18e71f4fb394b159fc5f493bdd38824e5a3a9c42084c5ffa1fbd383ad23
font_01_sfnt_off00012140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13957 10672 bytes
SHA-256: 952c41af27bcd64d3c6d9dbca634e9fbe76531ea826abdd8989f5b6769f2fe4e

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