Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1cc14d885162d0…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 04:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31de673af5083c3bb5f194ab3f7e7eab SHA-1: fcce55cb72d28c66a14706d3fd17b14910e0e891 SHA-256: dc1cc14d885162d0e56e4124b58addee17ea3031858ef71a98a0c50d72fe01db
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, one of which points to a PDF file hosted on disposable infrastructure. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's purpose is to trick the user into believing there are new or changed bank instructions, a common tactic in business email compromise attacks. The embedded JavaScript and link farm behavior indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://ux02.wadhost.com/js/ckfinder/userfiles/files/bifaxisiletejinisevufi.pdf In PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/zaginurasidafaluv.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/sesenipujir.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/5687304153.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5e30024f---roxuneguputibuguroxaxuno.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/rifoberiferam.pdfIn PDF document text
    • http://surausa.com/uploads/files/xetafakejewokoxupalip.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/lasadurazinasodovakif.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wovefise.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/19503841055.pdfIn PDF document text
    • https://inarsindbari.org/uploads/41861127425.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210912_982AD57D9A564A6B.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///11948740411.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/68571303953.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/74393246668.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/67814420045.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/75670523200.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161351480469a5---78304600927.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/nudizoraxawiwonuli.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/31512202636.pdfIn PDF document text
    • http://healthywithhart.com/res/file/kegojerobexakiburis.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/kabodapelebaweluzajo.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/66371785508.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/20397584877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=8+ball+pool+today+reward+linkPDF 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_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 10760 bytes
SHA-256: ee03d6f9eb3a3ec719857ff66bd3604e61165dc2deae0c93c1e37bfe9b9a967e
font_01_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 17420 bytes
SHA-256: 9701ef602c8edb50f6a3de88547b4fa05f614229a2b83842426f4cde50a62a80