Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cec507d7cea604…

MALICIOUS

PDF

79.9 KB Created: 2021-03-20 23:53:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2df4d4074767a4808225f23b7bc0b622 SHA-1: c2633449812cdf31a1030692e71dbea1472d4d23 SHA-256: 42cec507d7cea60498c29a46eed33d295f6c88a49d3e355ecf984bfc3b618cfa
194 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 https://cdn.sqhk.co/xafemepino/ujh0ggv/jenajutarevituvizobi.pdf In PDF document text
    • http://vigazorafoli.iblogger.org/71540784717.pdfIn PDF document text
    • https://gejiwafut.weebly.com/uploads/1/3/2/6/132683005/52bf2d7b9a.pdfIn PDF document text
    • https://dawasakubibovo.weebly.com/uploads/1/3/4/3/134384666/61b6b.pdfIn PDF document text
    • https://lilugotowo.weebly.com/uploads/1/3/2/7/132711957/1171846.pdfIn PDF document text
    • http://vofigasu.medianewsonline.com/al_quran_dengan_terjemahan.pdfIn PDF document text
    • http://zabogena.iblogger.org/jevemobapanesenizu.pdfIn PDF document text
    • https://ditiboxoteripu.weebly.com/uploads/1/3/4/7/134763901/nusujiwemogefix_gajiganu_xewudot_zixigorijokene.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/jJ4v5gD/22735207633.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/razvivatel/yapz/~3/gPkW7oTCsL0/square?utm_term=knife+hit+hack+android+1PDF link annotation
    • http://sakigekoxigukil.epizy.com/proloquo2go_core_board.pdfIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_6ff785c7e54f4defb3ca63289cec97f3.pdf?index=trueIn PDF document text
    • http://nudagimanefej.atwebpages.com/tekidajiwo.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_f9d5ef99fcab4bc1b51efa9e00b7ce70.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_f35e2409fa3c4a43af416bd1e8df3e7c.pdf?index=trueIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_e53201fa68f7409682ec50bad71cd929.pdf?index=trueIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/binomial_theorem_notes_for_iit_jee.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 4984 bytes
SHA-256: 82d8c2dec1c49e92e736c0407554bc8348ed192a4afba47a486f507bd2d5c8b3
font_01_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 11324 bytes
SHA-256: 64f7588e5adb79e5bcbbf9bbd4cc0cbf6bf8a556f5e121a2b42285a162e82f6b

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