Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa84a8ea86a7e9f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 00:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e14f945f5527626254e29268db6b572 SHA-1: 7a00b816ca89598845ff7222104c6b11e7dbd801 SHA-256: cfa84a8ea86a7e9f2ef1af2e29ca757ed18f78f90c3136e4307676b3980b2896
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic further suggests a lure to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--oy2b9bv81anouola.com/upload/file/202109130612204668.pdf In PDF document text
    • http://www.agot.pl/upload/file/tigudu.pdfIn PDF document text
    • http://praguetransfer.com/files/file/73937710214.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/polegelizobajilu.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/pufilidudanedexexekate.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/56542209720.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/33388507539.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/kabikalizoraw.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/rufowiwojon.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/vofamagav.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/mawinexumaga.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e429358f---keleb.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/molufuwixepakapavudavut.pdfIn PDF document text
    • https://12shio4.com/contents/files/67504959741.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/maxivud.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/21694118022.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/jekawo.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/gaxok.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/25114614302.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/40039926407.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/kopipazefenarirotazazi.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971681a785---59863057480.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/xajolukerezopofozexef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mp4+juice+download+officialPDF 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_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 10632 bytes
SHA-256: c0398a7d55be922e2150a39e0e196bd3b5c86e375afb157e0ef60aa2e9e0bc14
font_01_sfnt_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 18648 bytes
SHA-256: 445e7f279e38024ab6a2940b189c8139d12bc1225bb6a4ad25b23d428eb9adc1
font_02_sfnt_off00011c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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