Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d1c5ad88d89106…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 11:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b7484607ffdd1595c059ae9622e50f9 SHA-1: f25809e4dc086bf2879683fdc793447db9e03af7 SHA-256: a9d1c5ad88d8910677fd276fb444485113b91f03b514534c9f2be94d9f2f32ac
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links, typical of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pattarasawat.com/ckfinder/userfiles/files/52138599011.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/34570349297.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/52638403855.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/1109649573.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58748350364.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/5818482634.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf18f17af4---nuzorexogafireguw.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/wojudebejuzalofi.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/sonojiru.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210917_125236.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/36756875098.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/donewesemafoxipukesan.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/mizagebebo.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/xebujodovuveluwoluzag.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/labux.pdfIn PDF document text
    • http://vln.nl/files/file/56075864206.pdfIn PDF document text
    • http://tavio.su/files/file/jagagasenovovuzurep.pdfIn PDF document text
    • https://jjpremiers.com/files/dopugutategig.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/dixupaxojug.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/dasitekofufoxobilulub.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/vukodililafibokilodemiti.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/73819605993.pdfIn PDF document text
    • http://debo-fit.be/userfiles/file///77040982132.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/33495529426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=jump+force+apk+obb+download+for+android+no+verificationPDF 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_off0000b1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 11088 bytes
SHA-256: c78df21d752045909dbeb3468012a621d8af7eead85add1ef325761501b66e6d
font_02_sfnt_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 14392 bytes
SHA-256: 55a50ac350df28b14a230a3fe78ab3630af27f74d83d002d0d638cd909aa1a8c