Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6cb1bfdc59267f…

MALICIOUS

PDF

94.8 KB Created: 2021-09-19 18:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d86f877abaac0c48d00c57eaf1613a6 SHA-1: 63751f541ce395b718df870390ce7e2ff70c2b54 SHA-256: ca6cb1bfdc59267f82cb547059b289fcb1458f5ba108cb9119ff46652061f51e
166 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, with a high-risk heuristic indicating a remote-support tool lure. The document's content, though heavily obfuscated, likely instructs the user to install or connect with such a tool. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a phishing or credential harvesting attempt, potentially leading to the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://evaemlak.com/userfiles/file///86182889961.pdf In PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/sawililofegonakuzotifinox.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4e83579a4---renewi.pdfIn PDF document text
    • https://nistd.in/userfiles/file/78299459386.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/67099023726.pdfIn PDF document text
    • http://djapm.com/userfiles/file/68626905690.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/zerafosonofimokaz.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/beredafebukuwej.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/76868273440.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/zojagomiwoge.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/1843018870.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/6199522886.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/42376608487.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109141542265850.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/jetuzapikup.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/pajegapetedirixipir.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jokikalamemuxiresanop.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/63994355612.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/sofuvekudipeteliruwelop.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/41164705081.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/59257919113.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jofijolerimiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=atcs+monitor+android+appPDF 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_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 18264 bytes
SHA-256: b4db4ce917a5df5cc9b300b0e5d6ebf18396dd492b9fbc79092a35aa728d2fd0
font_02_sfnt_off00015612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15612 10480 bytes
SHA-256: a392be21344bae84637a71ce94d9d02878a2b0c4cc491a1ec19c31715c30534b

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