Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5fb790022b0d14…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 14:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 356cf869bb0a91e8b77d0a8fb914b5ed SHA-1: d3817fab404f1a03b384f8893ef06b39dac65746 SHA-256: ca5fb790022b0d1424085ea551014cf5decd938e00161a966f261022dd1f9459
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through redirects and link farming.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://ipayon.com/root/FCKeditor/file/kumadijev.pdf In PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/gexopuxabupipipawej.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/76902320591.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/mudekixevijilolava.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/xagavasizuzujepotup.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a87363425---32095061112.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-16/20210916143221269718.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/pujugekeralenepad.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/kitukopebeti.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/dobegipexozulomigukexiri.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/xikefimobinoborimetul.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109160033137079.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/91140070161.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/bomedanivuwimiwo.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/zomedikewafafipezufedaku.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614762d78c5e6---42850659483.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/witokizugonivugazul.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/73109172554.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210920205219.pdfIn PDF document text
    • http://venkateshservices.com/uploads/rupugevu.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/45579007198.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/84699082343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=offline+football+manager+gamesPDF 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_off0000b1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C6 16704 bytes
SHA-256: c6867d0a68cd55b0d08946a86f73f8f78c84e8515c09c06a4742baa52188cd32
font_01_sfnt_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 10724 bytes
SHA-256: 775a614a2b4ef805569c99b9caa3cc2f36530bcfa721ab0ae310a988a6ce6aba

Open this report in the interactive analyzer, or submit your own file for analysis.