Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e1fcc61b06b01b…

MALICIOUS

PDF

87.5 KB Created: 2021-09-14 13:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41b9988df8db4ced48b1fe34055e67a6 SHA-1: a9846f60dd1a0c234b865a2f29281546a778ada8 SHA-256: 33e1fcc61b06b01b58b14c31fdc94d7ec92daa1b0c7b3ed0a04e435cd0000b32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this behavior. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/fabdf7cd80581a8f057af47da805fbf0/25600649855.pdf In PDF document text
    • https://bangvetthuong.com/luutru/files/9935329480.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/36703236844.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/91726115799.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/rirapememawebesikol.pdfIn PDF document text
    • http://wernitznigg.at/files/35810013807.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/9081225934.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/53860382786.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/bidepajebujebuzuwezeloza.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/91526641385.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/42957358823.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-05/210905203024632580e4knkb595woz.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/tizonujaxinas.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/36442986940.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/vaxajaj.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/jumefuduvavewofoj.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/48707485312.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/49255459839.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/2197379962.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/41976620248.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/70197955298.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/vulitu.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/31220145821.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/nusewe.pdfIn PDF document text
    • http://jsdarvin.com/files/69402222505.pdfIn PDF document text
    • https://masihpt1.com/contents/files/pedawafesorukifoxutigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=express+vpn+mod+appPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 17428 bytes
SHA-256: 58622129d7cee034f6b896cedf74525c91d55a57cc9fe1fa1be488be76d55fa2
font_02_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 18636 bytes
SHA-256: bc4fe4a7a4b8ccbc2f3943b6790fa47af36947259d917d5da42405f0790d4b8e
font_03_sfnt_off00013868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13868 10468 bytes
SHA-256: 2a4caf48b088c48f86f37a138aa6dda49e2b7c359a5a649c291a908872093fdb