Malicious PDF — malware analysis report

Static analysis result for SHA-256 721f26012e42c4d8…

MALICIOUS

PDF

74.1 KB Created: 2021-09-13 23:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93084baddd5c4c92f7837be8e8e572c9 SHA-1: 4f544664419f35a9684ccb64f2a65a49cf6c437e SHA-256: 721f26012e42c4d84943234b4aaeacd59259f15f002818b7e1eebf2564e5f692
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which are disguised as download links for software, such as 'download gta sa 2.0 apk'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ecohort.info/userfiles/files/43545276034.pdf In PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/dotovunigunozamizid.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/farixa.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/pidobafuferuvujezolosulax.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/34ce2feb50032083edf153eb60a76563/69615182845.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/vofunumadob.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/lekosepenibeline.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210911180833.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/18818690686.pdfIn PDF document text
    • http://manu-transport.com/documents/file/pikeganizipilupifalola.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfaf6413d3---97979329143.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/41173723886.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/jisiwuzaxewagofakokeje.pdfIn PDF document text
    • http://moretonassets.net/userfiles/sasagoguronawukuvewugap.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/tukagudopulasepavupenu.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/fojafimojinevofuw.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/37625029775.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/luvenewizawajabef.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/40888003700.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/vibovujovaposuzosa.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210910185621.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/44211060305.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/pegita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+gta+sa+2.0+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A3 17860 bytes
SHA-256: 0f63cc0ebf2ea2fdd8a6c07ef48d373fefae72c2534f3ce50cd95729ac8b11c4
font_01_sfnt_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 10728 bytes
SHA-256: cf3049d39ac6e210a72433be398ceb50285d14e7d1153109b245e774c610b735
font_03_sfnt_off000111ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c