Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6e53d7e99cff61…

MALICIOUS

PDF

72.1 KB Created: 2021-02-22 22:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b7f6b83daaec82a6606ef1ed033230d2 SHA-1: 330e73429f9f69c43fafddc68183625826878ce1 SHA-256: 3b6e53d7e99cff61139ab7a60d553053902ef5454ddf58491f632a60448c5012
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://seumenha.ru/wix?keyword=free+instagram+followers+no+survey+yahoo+answers PDF link annotation
    • https://cdn.sqhk.co/seworani/HjaWClX/saxupikunonanaziriwati.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469350/normal_5ff18e2ebbd24.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/UMgfje5/fasuwiwogesozevema.pdfIn PDF document text
    • https://tivositazevuzin.weebly.com/uploads/1/3/5/3/135349871/9902836.pdfIn PDF document text
    • https://puxekubokoru.weebly.com/uploads/1/3/4/6/134683715/a81184.pdfIn PDF document text
    • https://vokefepafox.weebly.com/uploads/1/3/4/3/134333292/suriwivat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fcbaa3697896.pdfIn PDF document text
    • https://nidegezepon.weebly.com/uploads/1/3/4/6/134650885/bakiboveguz-bavasamalovo-rizulupuv-lekelanamomala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460230/normal_6023df46d1f1e.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/HieifY4/face_change_funny_camera_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5fefcfdeac620.pdfIn PDF document text
    • https://wesuzekubiw.weebly.com/uploads/1/3/1/6/131607103/d98bf43920.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/5465076.pdfIn PDF document text
    • https://jebilazi.weebly.com/uploads/1/3/1/8/131856389/sudap-volisaso-bapojejekeji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426409/normal_5fdfc8d8615bc.pdfIn PDF document text
    • https://giloxegikejuzun.weebly.com/uploads/1/3/4/7/134712531/jifilolijiwudamor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 5388 bytes
SHA-256: 6c3721501a8cf0874e4e4e9e25385ad15c27e2d5f214f6b06defb2929a44a3c5
font_01_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 9704 bytes
SHA-256: 9c1e6e0eb60fd8b3ac988e1e170840555dbc4473588644e8e2633f4af632d77d

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