Malicious PDF — malware analysis report

Static analysis result for SHA-256 20377207c39f2a10…

MALICIOUS

PDF

69.4 KB Created: 2021-09-16 23:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2488d515675a1b075d786d062637b5f9 SHA-1: c0b9d54b5195928d1f9a0cfac1198cb1efc50472 SHA-256: 20377207c39f2a104ba3ec3ecafbcfa68c583f171386ef76e7b491bbe2302477
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable or suspicious domains, characteristic of a link farm designed to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to lure users to external sites.

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://unitez.net/images/newtech/files/fezutov.pdf In PDF document text
    • https://mysilo.com/upload/ckfinder/files/jotofejowakudanagotum.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210908_1C45F0BDE2989637.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/25930025246.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/radabo.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/lasejojijurubeberelepo.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/56565961905.pdfIn PDF document text
    • http://fruitvita.com/files/files/54877916949.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/lewerumijajaniwel.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/dexufirenejogawajet.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/61809854627.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/kelasunubuxiturosovajibat.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210914000731.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/debururepunapidimusego.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/96144999da9c2e81a856c5462e8e922f/78160073039.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91021630888.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cfd961a81---85283866679.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/21852764954.pdfIn PDF document text
    • https://denimder.org/resimler/files/mawuwel.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/8595139333.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/89443510353.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/veledepususadaviputan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=demi+lovato+hotPDF 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_off0000b206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB206 15540 bytes
SHA-256: 7885fa32d2dd34756dad5760bfab1b35ebd9d98106696ee884c960c0bb4fd89c
font_01_sfnt_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 10068 bytes
SHA-256: 061bcfbc6fd4b27885c933648e8146e66e774142216579100e9ba45bb21ac366
font_02_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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