Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5987e5d235ecc3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 07:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd6747e21416774996e6722ee7492c27 SHA-1: 631bc755f3d578b4fd3cb2103acf20e797a44529 SHA-256: 3c5987e5d235ecc3b78d360803dc5bc7915c6a0d4438348364e235fb1e35b4cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://quangcaomattroi.com/uploads/news_file/gijubipemofefupere.pdf In PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/wetopogoxomemijek.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c518f1d8a---45122770503.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/berobufumogizok.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/1602545468.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/227166336.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/lunenubaxepisediratixoru.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/sujijizozejajuwexexij.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/nodibisutiwedazeno.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/narujesanoxaraz.pdfIn PDF document text
    • https://brakos.it/file/xegotobomoxasafe.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/95788712613.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/41786930460.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/kifitafenofije.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/nalefoxivuvagopapubekiv.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/15180506921.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/kiduxa.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/kefetivujitufijofimugugid.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/93834839401.pdfIn PDF document text
    • https://badrivishal.com/media/58219832926.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/dojopulewevu.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/xevofu.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/sovaxuriterozimut.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/40576499917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hollywood+story+mod+apkPDF 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_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 16992 bytes
SHA-256: 67fb97d20d18b744d4ebd2bfec4017244e2100e276998a8d20acb087b87a8b4a
font_01_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 10508 bytes
SHA-256: 5f6eb0fee3cd2bb48245c30ba57c2c4134513ffbe60408d0d083c3cebeba0509

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