Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b231ae7a0ffc03…

MALICIOUS

PDF

92.9 KB Created: 2021-09-09 11:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c6470327488bda04626b1ac94ffb6d8 SHA-1: 461b59498b5574a3907290e5e5ebc0d996b25d53 SHA-256: c9b231ae7a0ffc0305af60d5f31d6593058732fc771115d32eef5cc5d1391cc6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://burchiellati.com/file_fck/file/runadepusewawa.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d1d4dc730995d0a4926c4135194eccf2/rijidakatibakigiperuveba.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/vawatobuvamifugovolor.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/1466910835.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/78368546436.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/fusibexepox.pdfIn PDF document text
    • https://rinducm1.com/contents/files/47122404376.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/61169718622.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/17254579051.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/deduxu.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/gelebixenilug.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/zasadaropukofazebozavinid.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/69289798597.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/42495497285.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/84693630989.pdfIn PDF document text
    • http://strandedtattoo.com/file/wolewebemulifuxujus.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/fuzepijevotevuvex.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/36393465021.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/laluga.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/fujifobojuzanonodokog.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/4309105841.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/81321313899.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/21709103501.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbe5253600---varabunoxokad.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/7662010024.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210908052334.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/tenibupabobuminusika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=friday+after+next+full+movie+onlinePDF 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_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 17600 bytes
SHA-256: ff2c4f5b452f0922ad58b6a02f75c5c28488eac3367860f07f49d018f6c08f81
font_01_sfnt_off0001358d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA4 10708 bytes
SHA-256: 7b95b8d18fb273a9a9ae6311b37a342ec04de1f058a5edb128262f7c20e419a0