Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66f1f46d88ef720…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 09:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 84f2759c2f909b31b17b3da5040a875a SHA-1: acfc359a718cb91ef5c00847bf7d46a9bbc0e1de SHA-256: d66f1f46d88ef720088c2fd0fa6c5d86d67988d7ad26554ad655d1f85d6e019a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=how+do+you+clear+browser+history+on+android+phone PDF link annotation
    • https://ceiling.holcom.vn/webroot/img/files/wisoxutaju.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/6043504188.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/suxeni.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/dawizipumogola.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/87351926671.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/pivapizonowekowo.pdfIn PDF document text
    • https://96662888.com/editor_upload/file/66015322547.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/17624693360.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136159687838---49323061167.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/16788369909.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/73890327450.pdfIn PDF document text
    • http://www.heksan.com.pl/file/5673828193.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/paxojufalokakij.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/bufomopimajozetumemenuv.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/40356051935.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/zalazedefefukakegip.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/66785560599.pdfIn PDF document text
    • https://mbbs.hr/files/79246565362.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/2502735070.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/37372266088.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/xexunajariborek.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/28548091607.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/13665845283.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161470d9fca82d---92549951780.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/fukowiraj.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_off0000aed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED6 15464 bytes
SHA-256: 98316dcc05ccbfd0787bb800b04e17f82f2e28f1a2bc56292c187c8f5d137abd
font_01_sfnt_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 11044 bytes
SHA-256: f6f05b6beff084d748f38d7a77019e3c6e4cc2cf480c794c73a1f68de654d72e
font_02_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1