Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c73477fc0468958…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 13:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a013d0685601248c6c366d61c0556af1 SHA-1: 29f196ffd24c05f09e24bc8bc5cb40619238e2ce SHA-256: 6c73477fc04689584a9c165f39cc7a140bc53123dfdff818579345212ab5af74
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://friend5190.xyz/js/ckfinder/userfiles/files/88183456509.pdf In PDF document text
    • http://koreanhotpot.com/uploads/files/67974012726.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/zokizorejeb.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/ninamujemafadezarazob.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/vadinumoranudel.pdfIn PDF document text
    • https://laps.pl/userfiles/file/73545114664.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/figejiwu.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/xefawotenavevebifowowe.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613145517191b---xidaki.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/15569988761.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109041055418260.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/tobizaxafopam.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/94222649879.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/pasatonaxaropo.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904210832790864.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/rujemetusu.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/dasutabaniduzexofozasixa.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/15416843592.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/28520840396.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/58552649830.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/gafal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+screen+share+mobile+to+tvPDF 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_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 10780 bytes
SHA-256: 1424df1888a987d233bf138aa6228145566b1395aece057aec72d361f69ab55b
font_01_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 17892 bytes
SHA-256: 3a3901f3c780c820f8c631b6573036177420db21a38999d8728893aee6b9df21
font_02_sfnt_off00011931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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