Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ede409c0f0c3b17…

MALICIOUS

PDF

85.1 KB Created: 2021-10-10 14:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 80d52e1772d75ec0f8c75ffba026cbee SHA-1: ce9e9a36686fbabd4e00a3368800e519f481efd5 SHA-256: 1ede409c0f0c3b175fdc5b2db5856c3607be92c68ea6e1caeb5394e63baa07ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://huntic.ru/uplcv?utm_term=perimeter+equilateral+triangle+formula PDF link annotation
    • http://fusen-es.info/yamituki-n/uploads/files/3823761474.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/85191475488.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/83102295255.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/tuxit.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161541eaa88318---19578388530.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b14971ce93---gefuxonimo.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/1524644844.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/woniba.pdfIn PDF document text
    • http://artdental.hu/editor_up/fupazegakitunalituvatuwop.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/11385244280.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/fofosu.pdfIn PDF document text
    • https://eravikulamnationalpark.org/ckfinder/userfiles/files/wiwotatej.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/vawexom.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/39159923817.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/fotawijipenarunigow.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/92712372055.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/27705539097.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/90546625910.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/raveb.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/tosagital.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/dasesedefanobazojupefo.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/16430903085.pdfIn PDF document text
    • 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_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 10636 bytes
SHA-256: 8d749a062548887977c96c3d866321535dde729a80bcece19ec69232b204c8f8
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11198 20856 bytes
SHA-256: 4d22b21d62f8f1460e690d48ae826a848508c368376046c07dcaaa710bb49eff

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