Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe7dc0310d564c4…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 08:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b0e0ac1de7001bdddd44fbee49fafa94 SHA-1: 4b0c79cab9b145d6d0fb8d2a19602b84efec161c SHA-256: cfe7dc0310d564c40d1f45788083d4911c4279126c55832037eb6590c93f2a58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content. The presence of numerous unknown URLs supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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://odessawa.com/userfiles/file/17728077532.pdf In PDF document text
    • http://sieuthimayphat.com/ckfinder/userfiles/files/pinezizifoletal.pdfIn PDF document text
    • http://rld-carbon.com/file/37186301248.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161310b0ce1384---nirimamipewafizisuku.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/susoluseworunakaxusol.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/19195510089.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135440f87646---87897650422.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/96955659307.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/kerot.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/47207321523.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/belopu.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/26457020992.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/wabijovozezetorajuxe.pdfIn PDF document text
    • http://hmed.vn/upload/files/21335607223.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/gozuvanawujoxerusonitife.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/kafowobozuwopovilajemoxu.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/33115347225.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/63320059165.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/36857278366.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/67498161761.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/97449520227.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/jitirukexede.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/metoradozelexi.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/xidefarafilodateleka.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/5607899221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rom+galaxy+a5+2017PDF 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_off0000d582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD582 10496 bytes
SHA-256: 16bd183381d4853591bff0f2dacc738d72cd43a99fc6fc8b21e02596c1e412e8
font_01_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 17688 bytes
SHA-256: f0adc75ac2af28680fd0f2a1c8841fd79b4262880092272f3be956df5a8a5670
font_02_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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