Malicious PDF — malware analysis report

Static analysis result for SHA-256 353a16e89f800c80…

MALICIOUS

PDF

72.1 KB Created: 2021-09-29 02:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 344e611e76bc8e158f5c927f95e9e395 SHA-1: 686acb4857b685c3fe207be76e7a1573a7c46077 SHA-256: 353a16e89f800c808788cd0737564ffb2e340336a394193e4910849038eff36b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or redirection attempt. The PDF structure and embedded URIs suggest it's designed to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://crewmak.ru/uplcv?utm_term=one+piece+episode+957+online
    • https://acryl-bg.com/userfiles/file/8800050037.pdf
    • http://stamforgtechnologies.com/uploads/2950868213.pdf
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210910213754.pdf
    • https://movingalpsfoundation.ch/userfiles/file/69559943244.pdf
    • http://radtel-sport.pl/userfiles/file/xuzogenojevodapub.pdf
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vivoxagajixetoxefop.pdf
    • https://cjsc.se/ckfinder/userfiles/files/pazatitubekokikamubibolot.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/58620906100.pdf
    • http://world-green-hope.com/uploads/files/40315352215.pdf
    • http://szkolaprywatnaleszno.pl/userfiles/file/jakevixulewekibatezezo.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/55237014442.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132189ec0ffb---95496218900.pdf
    • http://www.medicellbank.com/userfiles/files/jisir.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/tidiv.pdf
    • http://eamenfaraz.com/cache/fck_files/file/xipetanomivaxaraxevope.pdf
    • http://kotolantopeni.cz/file/wekaw.pdf
    • http://sukhonthip.com/file_media/file_image/file/joxekezoxunakafal.pdf
    • http://leaguengn.com/userfiles/file///87977026075.pdf
    • http://ohxto.com/uploaded_files/userfiles/files/48222036254.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d46cbc53---jewuxipupuz.pdf
    • http://moscowprice.com/content/xuploadimages/file/gamugatulefoxova.pdf
    • http://dailycan.com/userfiles/files/jatikori.pdf
    • https://home-consult.lu/userfiles/files/zunovuzep.pdf
    • http://vitanova-cattery.com/upload/file/23129192494.pdf
    • https://fiscconsulting.com/userfiles/file/mujivuvida.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3bc.bin
de5d5c4e4801f96d05d41a2d53fa9ba7653fd96adc086c3ff247624a669c4962		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BC 10524 bytes
font_01_sfnt_off0000cbd9.bin
d8ba393caeed3a76b6b062c1c42aa3935e9e64809add55825f2108b6a11701ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 17556 bytes
font_02_sfnt_off0000f8f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 16792 bytes

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