Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4b3b968473954b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-11 21:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5f3c306f81be1e938b5604efcd55476 SHA-1: 8c586a3356051c03c0558aee77ca3dd5eff03290 SHA-256: 2b4b3b968473954bec39ed4d9ece58c2651880d426bfc231ca8c8c14f2153f5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains a large number of embedded URLs, many pointing to disposable or unknown domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://greenhere.cn/upload/ckimg/files/202109111848549769.pdf In PDF document text
    • http://fluorescent-training.com/file/27955041819.pdfIn PDF document text
    • http://school15-tyumen.ru/f/pinigirafodiwoxu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bfc6ca683---87228089231.pdfIn PDF document text
    • http://gyliver.ru/files/files/73996401493.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021961011282180.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/fozinivu.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/42329634806.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/fe468cbb638b68191204182f25529b91.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/fapizafirixu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6f5b7da3---fakosuginimovij.pdfIn PDF document text
    • http://www.centralperdana.com/file/fovejozefazevutedipeduje.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/gisizalomikibejumakez.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/51160947930.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/kuxixu.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/28610286905.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/lanumibakumepapezu.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/fafuragafimajamadafo.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/91463524348.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/niguxabonululomop.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219754545695.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/97741028306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=game+for+windows+7+offlinePDF 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_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 10592 bytes
SHA-256: 6b6f1eac9736ddf17db2e87a2eb9559c63734af701c77ac86acf810331681f11
font_02_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 18040 bytes
SHA-256: 567a3168b72b8f447f31f8f26a12eff8dcb8402fdd7ae59e2c2c35a934ff9ebf

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