Malicious PDF — malware analysis report

Static analysis result for SHA-256 4212c7e309933073…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 23:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55cb37eca2e59d0e461f8259b1586b42 SHA-1: 32e80c6b19ec421eca133ec2338d3c7c2bc96c2b SHA-256: 4212c7e30993307347847d1f8790a809c008410bfa585319d45028bc6c5489eb
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final malicious destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'ML_NYX_PDF_MALICIOUS' heuristic suggest the PDF is designed to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+online+putlocker PDF link annotation
    • http://haai.org/upload/file/jetapopidedaxogedobap.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/guboxotijawojijopokaveja.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/99181758755.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/26123725822.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///zopuweloxonuwoluzakoz.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/pupezowopur.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/13334263417.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/fasupapafawe.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/tokapakagiwuj.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/bakewatonaruzivive.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/4705514155.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/mapulusoxor.pdfIn PDF document text
    • http://www.agot.pl/upload/file/nonotojojeg.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/fobadasovepe.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/97309701672.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/35435088682.pdfIn PDF document text
    • http://mq-water.net/upload/pupexudizepubumu.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/tarojon.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/27845831691.pdfIn PDF document text
    • http://linyuepharm.com/upload/files/jotudoligasizujesuponijef.pdfIn PDF document text
    • http://santeh.md/img/files/wawujedode.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1df35d883---newafixepupa.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/61764431395.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/nowagilo.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_off0000d8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 18844 bytes
SHA-256: 6383b6801aa07fc99f6e4441ddfafca71ee362573f481580ea7d2ce13c1f24dd
font_01_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12106 10944 bytes
SHA-256: e8833196f6baab6ec60f9acfa66d6808532baf98560bc8ba6e5fcbe1a4df2b20

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