Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46471ba90e8ea68…

MALICIOUS

PDF

72.0 KB Created: 2021-09-23 05:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2b5919fe822c7c2f6b0064dd58c822b SHA-1: 116271c1d2ed325dd17b148748ba96a90f4ffd34 SHA-256: f46471ba90e8ea68978adccc01eef5dda25a54b9af16d23498bf25b69a473276
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm or phishing attempt. The document body is heavily obfuscated and unreadable, but the heuristics indicate a link farm strategy designed to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://jinyezi.cn/upload/ganedoduman.pdf In PDF document text
    • http://fibertechnique.com/tmp/file/76704021907.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/popamubil.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/40729037660.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/77128154042.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/79291489623.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161400d7b74b6d---77083029598.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/68545071423.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/sizuxubev.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/xarenubimul.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/2781997641.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091010372873499.pdfIn PDF document text
    • https://pellevah.com/upload/files/wuxoguvig.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/93841051806.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161306c0959d47---10680016999.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/30867376871.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109040956498907.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/nefipob.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/9715791612.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/zatelidamogexitamizoxije.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/kawebedofesi.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/65907810683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gogoanime+app+download+for+android+tvPDF 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_off0000b735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB735 10864 bytes
SHA-256: a7075bdad8699a0dbbef03af612898da19c1b235b3ba5a7fc442f92625bc3ba3
font_01_sfnt_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 16472 bytes
SHA-256: b6b74d9bfe80d513056c46efe2feea0b99f2829a25c0e3f2368e67e708ae9c08
font_02_sfnt_off0000fa26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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