Malicious PDF — malware analysis report

Static analysis result for SHA-256 86380560176f402a…

MALICIOUS

PDF

106.3 KB Created: 2021-09-13 13:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2cfc135705a655dee28484a1583cd137 SHA-1: 412a760565570fdaa91f59f1198d900b9925125f SHA-256: 86380560176f402acdd08ff971bd33da4db4d496c72075126f83fdb44d573d27
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of malicious activity, including malformed streams and a high ML classifier score. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://timnhanhonline.com/upload/files/89878433459.pdf In PDF document text
    • http://klm-co.ru/foto/ck/files/gunozemarasajufafeg.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4d1633e1c7af9d272675526a89b2b2a8/rodavelaviwufez.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/vugugilo.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/576668293.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/lijagifogasakavipawana.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b5598765d53bad1d04ee9fd12cf390d9/73467364964.pdfIn PDF document text
    • http://esipro.be/userfiles/file/35636794003.pdfIn PDF document text
    • https://halead.com/uploadfile/1631413826.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/modekobiw.pdfIn PDF document text
    • http://4bx.pl/public/file/51169111474.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/16979849386.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/14421056816139834d816e5.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/davaru.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/82868067984.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/madejoforetujowajipezuna.pdfIn PDF document text
    • https://digireg.cn/upload/44176580753.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/kidun.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/88764318460.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/53661502685.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/82421414105.pdfIn PDF document text
    • http://lgassociates.in/uploads/27403199565.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/89716062985.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/dojafudabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=attack+on+titan+full+movie+part+1+english+subPDF 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_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B67 11356 bytes
SHA-256: 46990a8adce157b63795133ad9d8a9defdf6b4560fe58f777a98726e8e0efd03
font_02_sfnt_off000165dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165DC 20376 bytes
SHA-256: e658f8b0af447f2fd6b99cde132f9354de662a5c9eabc594a58b72afafdbb553