Malicious PDF — malware analysis report

Static analysis result for SHA-256 293e534d5c9e2123…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 08:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1021449aba773c987c9554f4b0e041ff SHA-1: 67a0cc7ac41575e36336269f7e046ae7c188e921 SHA-256: 293e534d5c9e212369555594cebfabca2d9dd69e531c3682a02c90f48040b9cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and embedded URLs are indicative of a malicious PDF designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smirna.pl/files/file/tidinone.pdf In PDF document text
    • http://massvt.sk/editor_uploads/system/files/58165406280.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/32764669685.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/76941686501.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/30775122089.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/6564555319.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/24297383146.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/27152949077.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/mizokij.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/tizerobasolabovuxip.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/2755251830.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/linofejuwokalojuvapa.pdfIn PDF document text
    • https://bursac.net/userfiles/file/pavorufi.pdfIn PDF document text
    • https://triosms.com/userfiles/file/2719267868.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/nolimosavapepono.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/xikidufuburoze.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/4428671274.pdfIn PDF document text
    • http://philboyd.com/97784231209.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109132346408400.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3e6a09aa9d5dfef06380d978410b3f19/mobulobupumuvulu.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/9666919004.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/60241860604.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/wawiduvoguxekivuduk.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/lukurepugunopejaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+connect+mysql+phpPDF 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_off0000b3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 10860 bytes
SHA-256: 4dcacb375f3cbdabcad3dee11817e832e1df702e7240941798b06117376bd222
font_02_sfnt_off0000e4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A6 16620 bytes
SHA-256: e09049c883153267e3b6ebef535495dd77e49a334d33355a5d91f871629045db