Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd906ee1c677d91…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 13:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7670b230b7e5d29588d3bd711197921b SHA-1: ccad7dc46619c4c47d955a69517ec1f143f3836c SHA-256: 0cd906ee1c677d91806aa3f29d1d8e28e39e9aa56d86ebe7218089af6d73ec00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded links point towards an attempt to direct users to potentially harmful external sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://waetsukai.jp/system/ckfinder/userfiles/files/43992483645.pdf In PDF document text
    • https://damsindia.org/admin/uploads/file/46896979252.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/42093216763.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/12513120734.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/38113750669.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/zanuwixudadodevowupeviwer.pdfIn PDF document text
    • http://partnercable.com/files/nadalapudazodisonolepa.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/gosuvevexiki.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/tibodavisoliregisowo.pdfIn PDF document text
    • http://asqcert.net/files/files/18562943265.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/78411315946.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/71okfcasudahcka83p7j2l7gfr/61064149389.pdfIn PDF document text
    • http://umhouses.com/uploads/files/kolafu.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/2952804342.pdfIn PDF document text
    • https://alohasafaris.com/files/21148416645.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/79953045240.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/konebofibexajipetinisuwiw.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/sapalade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=puffin+life+cyclePDF 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_off0000c931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC931 9896 bytes
SHA-256: ee72e91c207c199b881e29e1f39d6d2727cc042ca617db818d8e7f1ebfcf79b9
font_01_sfnt_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 17180 bytes
SHA-256: 3c570e0826c783848f473248d4fc61ba41e872c2e2e1374e067902f46a184d5d

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