Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd976b58ea4b9918…

MALICIOUS

PDF

68.5 KB Created: 2021-09-12 23:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c6714aa5658042faab0fc25e0a1757f SHA-1: 28864ecf69a8a9f83a1a2801b8f2033e600ea03c SHA-256: fd976b58ea4b991867ec76aa2d371f0f59035dea678eb3824dbe3783470f4ee6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or content-luring scheme, likely aiming to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://intrinhgia.com/admin/webroot/upload/image/files/50066394837.pdf In PDF document text
    • http://murasakijr.com/uploads/files/gegagalazeresar.pdfIn PDF document text
    • http://patroha.hu/file/26853150004.pdfIn PDF document text
    • https://securitydm.net/slicice/file/50175053623.pdfIn PDF document text
    • http://totoumi.jp/upload/file/ruwujolid.pdfIn PDF document text
    • http://rooptex.com/uploads/12496328248.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613082cc9cdc0---jomuwibuj.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/55506270853.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/xodaviki.pdfIn PDF document text
    • http://rapet.hu/files/70806352451.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/75575525249.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137d16e6e191---22318994979.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/26579080471.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/26787747401.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/gigugaj.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/nakuvesenekejawazazibal.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/movupizororozimit.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/xiruwijiwanago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gta+5+mobile+apk+filePDF 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_off0000acfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACFB 10552 bytes
SHA-256: b8f3991c903a6034e0dfa6e73c115a86967f207768bf3475c7f79d3c93c78a51
font_01_sfnt_off0000c4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E4 15732 bytes
SHA-256: bf2f171854e12525363be172cbc9b3b43be36f96f3c738d359e1cd5854687007
font_02_sfnt_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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