Malicious PDF — malware analysis report

Static analysis result for SHA-256 66eec77b80491bfe…

MALICIOUS

PDF

72.5 KB Created: 2021-09-13 16:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2f71043b1624e0f87762dd37033f901 SHA-1: 83bf68668672766a18f6028e40b643348f1516cc SHA-256: 66eec77b80491bfecd31ebb3f809a9534c361874e57fa862f44f101ac87e18d5
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=white+label+rank+tracker PDF link annotation
    • http://jjc-dev.com/userfiles/file/61610785525.pdfIn PDF document text
    • http://stl-hk.net/userfiles/bixorezu.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/godasolufagefaguvo.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/82065870984.pdfIn PDF document text
    • http://dentistturkey.com/image/files/vatired.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/lafurez.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/47986251487.pdfIn PDF document text
    • https://bor-diing.com/upload/files/46325628710.pdfIn PDF document text
    • http://fructusartis.com/i/File/45162864138.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/jafozoxixagewelewumax.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/niguniv.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/peramizuxojadotobemiroro.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/benisakogizasofamiva.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/25524493208.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/70926859871.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/minoluduselemowo.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/21065227355.pdfIn PDF document text
    • https://mikludava.lt/images/files/71586060685.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/zowukuteloginapisuvux.pdfIn PDF document text
    • https://hiroyoung.com/data/files/nogemoj.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/73837825079.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631070601_1.pdfIn PDF document text
    • 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_off0000b957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 16964 bytes
SHA-256: 1669b4b87af2d91042758fa7e934726239e0fc68b9bc3fd4e0b3ab5a16e7a7a7
font_02_sfnt_off0000fd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD96 10264 bytes
SHA-256: 08707ccda7daea940d3ac6929a3901e5dcad1fe61e42a6992e2171e3d32a6408

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