Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9a34333c33a5a3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 07:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a96f1b2de381e6dbeaeac4604e22ab7 SHA-1: a7849f08eed7ed03a39028decd13b99331c0563f SHA-256: 8c9a34333c33a5a364a7caf5a86afed71d40807c11271394fdf911d3a1e82547
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://karimeh.com/public/userfiles/file/nisada.pdf In PDF document text
    • http://hanasushipickup.com/uploads/files/milasokajalat.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/27488884866.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/299683462.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/gonumisedujavepunomele.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/46312205271.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/zexesa.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378b83b1f7f---jimulevetetamivu.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/73825280862.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/bavufolemelesukazeduva.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/titapobirudedafipo.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/mazakuxoxijim.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613a21868f7fb---1463498704.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/49973664621.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/36544064002.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/47455316886.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/ruvupolub.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/98007217526.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/wituge.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/bofegibexexi.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/sifumalurinilatixiwefiz.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/konoxew.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/77183254900.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/joxova.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/dovodis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=google+keyboard+math+symbolsPDF 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_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 19184 bytes
SHA-256: f68dd070d7317095e7945802d8998d21619cae3eceb5ef8c77f3d9952846d77b
font_02_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 10884 bytes
SHA-256: b6cfe4f1cad6b4180a136633a9f270e06faedae73dd21cf537ccafc12022401f

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