Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0b2162ff00e2d1…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 01:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea1ebaecb188360d66f6ccbcfcc04939 SHA-1: c6e5a64fd5cd67e321dfb45df99fc898759cdf5e SHA-256: 6c0b2162ff00e2d1719495d6faa63c1fa9affd3d6f54a10ff1690c12efa3bea4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://aranysolyomfeszke.hu/editor_up/rakebejunoxada.pdf In PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/kiposutozivu.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/safigewonufujene.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/podoxitimu.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/pevapowem.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/jejide.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///ratuxe.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/91736159910.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/69215314136.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/buwudubaka.pdfIn PDF document text
    • https://jurad.eu/files/file/dibanupakerefupobuxinawi.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/dewubobuwulutudetigevij.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/keledok.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/77225270714.pdfIn PDF document text
    • http://mayjack.com/upload/files/jovulosa.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/63317772901.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/wamun.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/14961596565.pdfIn PDF document text
    • https://people11people.gr/uploads/File/kepitakabipado.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/53125924273.pdfIn PDF document text
    • https://majubesar.info/contents/files/77260388636.pdfIn PDF document text
    • https://trieurodata.ro/images/file/70513945002.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/vubefupiwilojupokixi.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/25407385686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=nimo+box+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB5 16844 bytes
SHA-256: 59cd3939368bd91ec72d62f8c474f8e292d5c861545bef597b3c05717c3429a5
font_01_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 10076 bytes
SHA-256: 9a9c78ba1475977b57e4ff6fb482e7af0771b105929b708d7dedad572ce5628e
font_02_sfnt_off00010cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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