Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52e33ed54e34a9b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 04:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 363599e2d559a431fb0771f2517f5506 SHA-1: 428cca4166530768d902cd39e1679dafc87491ad SHA-256: d52e33ed54e34a9b7dff9ca532c68d964499c6050709cdc4db621485ccb40b21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ryokanclub.com/FileData/ckfinder/files/20210904_66D34024E33ED15D.pdf In PDF document text
    • http://www.deewanalarab.com/up_imgs/vesovanibu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd15766c75---ruxakamafupuxapedusaru.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/42171885356.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/nusatedunoluwitanat.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/43293197059.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05d0e5f1c---33919037053.pdfIn PDF document text
    • http://sbkf.org/files/files/wejipevaramesidixofome.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/bovibaposigujepalugikumuf.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/89938479985.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/pinumodagoderaxozeniz.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/lezowutadarugifepopeze.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631569984.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/39317330960.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/52275355793.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/80861365865.pdfIn PDF document text
    • https://lapakunited.com/contents/files/diwosapajulelod.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/22162495228.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/76809834048.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/53193638453.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/80190653468.pdfIn PDF document text
    • http://lg-palette.com/upload/files/47488929197.pdfIn PDF document text
    • http://glassick.com/userfiles/file/bovuzoforunapitadunitako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=xtra+for+twitch+iosPDF 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_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 17852 bytes
SHA-256: 1f9f555bdf325bd8960234635fe80ab081b70305aa5e0486ee786052a5b1035d
font_01_sfnt_off0001147a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C91 10244 bytes
SHA-256: 64cf733f437a93ac0815b6ba40e8f643ff05625e9b88309928c9b322024e3c51

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