Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e77eb97cc4612e9…

MALICIOUS

PDF

93.8 KB Created: 2021-09-08 12:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0803e2e997c483f3f0e3fbfeb88b0ee2 SHA-1: 51bf1e0ecd28493f9365909609bbdde630f30921 SHA-256: 7e77eb97cc4612e9597639c872403bd57d6f558c621763ddf71cb12b05514988
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains hosting other PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, a common tactic for phishing or distributing malware. While no scripts were extracted, the structure and URL patterns suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://standardamulet.com/files/files/watibekito.pdf In PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/77431060329.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/80391447403.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/lotenoponeromubo.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/19273363567.pdfIn PDF document text
    • https://12tiga.com/contents/files/zewerimabitisimuba.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/80354559061.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135f24841a37---38532368317.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/29505910491.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/figemejivikasodumisoj.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/guguxebot.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/lolawofisonokozoto.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/62635594005.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/fugamumuwexuvemumupix.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/23159299367.pdfIn PDF document text
    • https://domilot.com/uploader/files/tudil.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/32627567872.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/64640923830.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/26430997600.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/47627915612.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9cca74177bdac02dac2c0ca7eb8cd0c4/benawokozaxilijusafuno.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/70960695063.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090515555029.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/96559095796.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/9248495657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=coleman+portable+gas+grill+manualPDF 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_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 10864 bytes
SHA-256: b8eeb54ef2d017052acb299deedbc4d72bd463294c43957e91100ff5555f9468
font_01_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DB 19236 bytes
SHA-256: af0aa2d85e6acf756c971b1192ac51dffc0ac54a47dc4cd64b707499ce34dbca