Malicious PDF — malware analysis report

Static analysis result for SHA-256 a962ff511d93160e…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 13:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb58bd4a008e3b66c5b9950199614a71 SHA-1: f0c4f7ea47af12bd96c949477dab7384402ebaf8 SHA-256: a962ff511d93160e39c16adcfaf7e6e5861f2c53781b5b22d2f49cd9621084e6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, many pointing to PDF files on various domains, indicates a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ladyvenus.it/userfiles/files/62390477581.pdf In PDF document text
    • http://detaycopymatbaa.com/userfiles/file/44263634793.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/8420784755.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/dapoponunixilisij.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/37480380587.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/72635083146.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/diwulaletozidojazo.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/51850793691.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/zudoludabijewixagupo.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/mopibasolupeduxo.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/fobakiwivimoke.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/midodumolev.pdfIn PDF document text
    • https://angkalaris.com/contents/files/gerotobadejedum.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/larogomag.pdfIn PDF document text
    • https://mcsfood.com/images/file/befelozarudozuxewubogibag.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/79930218196.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/45036068035.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/67180511529.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/54200282879.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/36677291856.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/6501040056.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/61778354531.pdfIn PDF document text
    • http://suaups.net/userfiles/file/kilijulelonaragalujive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=top+pc+games+to+play+2021PDF 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_off0000ad6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6C 10792 bytes
SHA-256: a504150b26f4038379c8c9436d3e3fcec3537e5f4af7e2ed657d86645c4a153a
font_01_sfnt_off0000c683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC683 14648 bytes
SHA-256: 3b709485ef0878ef8e282587933d407755bf191de2a32fd4a00fa9bd2a9f0223
font_02_sfnt_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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