Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b82ac7ca1168d09…

MALICIOUS

PDF

98.6 KB Created: 2021-09-15 20:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94b4af3d4f0e36780cad0db94292ee6a SHA-1: 858b23bd7887586b07e551b1005cbcf4d915a98e SHA-256: 2b82ac7ca1168d09601630fdcd35a310674764edc1a527766eedf6a8967f3ab2
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URI heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=bagumbong+caloocan+city+zip+code PDF link annotation
    • http://luyenthidhcanhsat.com/Images_upload/files/razotutev.pdfIn PDF document text
    • http://vhktn.at/images/content/files/27575354886.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/kuzibesuwakotu.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/satotekemupipep.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/xasijewogof.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/5733564080.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/netaxuloke.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/dedixixavajubaj.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/77558844387.pdfIn PDF document text
    • http://qdjshg.com/files/file/28641400345.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/62778200916.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/31401831395.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/duguwez.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/lowujukufuza.pdfIn PDF document text
    • https://path.mn/userfiles/files/24440020570.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///87395813479.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/77057910031.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/fusilesakegusobegekenop.pdfIn PDF document text
    • http://mc-opony.pl/files/file/57002157446.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94395117095.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/julebajamoj.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/28846785486.pdfPDF link annotation
    • https://takitech.hu/userfiles/file/koxezonegirisilanokotirad.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/suzez.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210902123143366.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305eafb9f5b---kirilixafajagepewugesitep.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_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 17800 bytes
SHA-256: 01e83ce8c45ac2285e211f295378636a5a99013add1718a0e13cfeb469581b63
font_01_sfnt_off00014ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000162eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162EB 11056 bytes
SHA-256: 58a6848ecb7134ad177d800738eb4f1b552377ff4d6e0725c17937b7fae4a018