Malicious PDF — malware analysis report

Static analysis result for SHA-256 da21a46d5edbf3c9…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 07:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc3e01c286741c8d98f2da50b8eedd56 SHA-1: 189236e874a6084c0ff44a13840a50731a0fa7a2 SHA-256: da21a46d5edbf3c9212c8bdf8e09158f722baa9cae51dbcac9aaefb993e72972
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct and disposable domains. The presence of numerous unknown URLs suggests a campaign to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://mmeasar.com/mmeasarfiles/file/miwamizajoriguvorefefufe.pdf In PDF document text
    • https://apra.pl/files/file/zidurulovufibetusugo.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/sitakajimez.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/23986874390.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/borametolarizuzogapepe.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/xowasexupekagefenidi.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/megevepadafemuvixaruzo.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/99362404967.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/vuporumefivuloxobezuru.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/73800110965.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/xufegoxipunaf.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/kamerakamigewiluf.pdfIn PDF document text
    • https://shidoremicrosys.com/media/79848806585.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/borilapapevo.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/lepuza.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/sijusosasusimil.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/losin.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f35c231eb2---wuruxoniwuwolev.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161405715edb4c---molezonujukipotifazowa.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109161705458555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+turn+on+auto+sync+in+androidPDF 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_off0000ad61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 10476 bytes
SHA-256: b8fb975a18d3857953819b5d0ba73bd1429cd13ad1748e8a705371320b472daa
font_02_sfnt_off0000dd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 17976 bytes
SHA-256: f2f3a457f206085a1f245b9d29ca916cfbb7d85d58ebd604bd8e1743d94f0909

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