Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9f7afb50e5b5ee…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 19:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5d27fb639e670b766899ad43f008ba4 SHA-1: ba78887eb8c95ad3ea48de2f2f24a54393566250 SHA-256: ef9f7afb50e5b5ee1c204bffe4160695c0cc13e3867c83085171c90044f22ac0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many of which point to PDF files on unknown domains. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://protradingindia.net/userfiles/file/wirogugizudazizugosiriwef.pdf In PDF document text
    • https://ahreco.com/uploads/news_file/81877109211.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/korafapeg.pdfIn PDF document text
    • http://tayles.com/uploaded/kapagofimotaturesupisoko.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/47012584569.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/xarelodara.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/4946064961.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/nadatizedajisuvoliwapo.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/85716640872.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/fepolakimirepabovofelojo.pdfIn PDF document text
    • http://vhktn.at/images/content/files/60915852139.pdfIn PDF document text
    • http://gibisch.info/files/files/88038208187.pdfIn PDF document text
    • http://wjcopy.com/upload/files/95323310282.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/zikexenavepovesogiva.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905135623629552.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/76231157760.pdfIn PDF document text
    • http://mylodge-naoshima.com/poxopoxikubopasevag.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109022015065929.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/fadipufegozojarewuwote.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/pawujiriraveveguvi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e1040a541---mujixe.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/wesovefukikejitolebug.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136533ccb504---kexororiledoxoripuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+app+to+close+background+appsPDF 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_off0000d61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 17844 bytes
SHA-256: 02b54b055436ef6dca3b6d1c01d58bc30bdfd1fbfa1355cb3b526b67abf630db
font_02_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 10984 bytes
SHA-256: 7fe1854f58476f1e2037abacc0ceb72c219fbe3597d34fd2ec47e040905713af