Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abf5d4a0a0c632a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 11:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: c7df20c89a0edfce169f465db675b4bc SHA-1: 6f9e42ad1a72a760e1e7bc4ff1269f970322eaea SHA-256: 1abf5d4a0a0c632a1f4aedc4239b20164a75ea2fd3ce9d8b1c45b22592487ef8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lure users to external, potentially malicious content, fitting the profile of a phishing or scam document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://rothemtour.com/FileData/ckfinder/files/20210909_B500B6929B58229E.pdf In PDF document text
    • http://zsdbiopharm.com/upload/files/koruronot.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/41744637695.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/79157226974.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/mijazu.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/93762269401.pdfIn PDF document text
    • http://talleresjpg.es/img/file/82284051581.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/dixibotogipi.pdfIn PDF document text
    • https://denimder.org/resimler/files/sumipitekujimeza.pdfIn PDF document text
    • https://oasis-travel.ro/files/xuwabilotunimugetetited.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/wixizeforegadiwiwoji.pdfIn PDF document text
    • http://www.pilartangguh.com/file/ripijotol.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/vanuritalowobil.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83667906202.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210914113028.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2082a4eac826e40b738fb6f54f18fe31/rolegezukavop.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fofibinizozul.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109100155181641.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109030614046692.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/tenadetenip.pdfIn PDF document text
    • https://wecareprogram.org/images/file/73853048280.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16134839e8700f---fovozufilozomanok.pdfIn PDF document text
    • http://storemisr.com/uploads/files/26721003511.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/gikitatinajaxupakofowen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=i+forgot+my+wifi+password+androidPDF 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_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 10812 bytes
SHA-256: aabb090764c110e65de8d0b227c84ecc3f3e9f593d9902c3289b7b15806bb54d
font_01_sfnt_off00010246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 17768 bytes
SHA-256: bc9546d3a43922b3763f0f0fcdfedd22c7ab6078d7554b8f8218347901dcb1de