Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd9fd2d230d8e37…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 05:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7935c88b50065ed2c32c3e113bb0e7b7 SHA-1: 32e2d5a3ccc04f01cb9fd8d7932097ad2f683825 SHA-256: 1bd9fd2d230d8e37eada874cb204d31eccb06d6f44f80645c63e234b9bd3b6e2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. Numerous external URLs are present, many pointing to PDF files hosted on various domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://uptindia.com/newsimages/file///kovolidezo.pdf In PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/62029207957.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/gexeb.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/90995719937.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/12109030511.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/giwikavo.pdfIn PDF document text
    • http://mosjob.ru/images/file/vusirugebezofobidesedezo.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/82622217789.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/63658157816.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/kavubakuda.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109070908248729.pdfIn PDF document text
    • http://dakov.hu/_user/file/sawikiwepukese.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/lupulexovus.pdfIn PDF document text
    • http://ing-ka.com/user_img/file/fewugozitemufomelefovap.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/notowozitoxekiverenupabe.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/89568593924.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/datajasobudosowaziz.pdfIn PDF document text
    • http://geasit.it/userfiles/files/nupogekotewedojetanozir.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6e8e2bfa---71994561054.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/61676880669.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-1/20210901074613145197.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/lupakedisotelijamim.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/46648091477.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/4967476078.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/46948025766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+lock+mobile+screenPDF 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_off0000cdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEB 17192 bytes
SHA-256: 2f47fe69d6c93fdb410eb4039d1ade3ad2fbce661207b19618ed26df482d42b2
font_01_sfnt_off0000fa56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 10540 bytes
SHA-256: 5ddf176f04089b2c738b9215dc8396343551495b7a7f94c84ef39dad8df7ae90