Malicious PDF — malware analysis report

Static analysis result for SHA-256 066b558c75c46b30…

MALICIOUS

PDF

72.3 KB Created: 2021-09-17 18:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a180bd52ff94757f23864acf019bdbbe SHA-1: 153cdf01aa06fc7f48e309a4209398290da58daf SHA-256: 066b558c75c46b30d0dd7fcf8fde0b5f13e5b19fd8ec11b11d7a0cc08b1392b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs extracted. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vjlabor.pitscovn.com/uploads/Upload/files/59785821035.pdf In PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/2448557717.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/13050240210.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/veravakuno.pdfIn PDF document text
    • http://irinabailey.com/upload/files/87529018667.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/87945891528.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/lupekavu.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/30195803682.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/merilefavuxavudoxowiwa.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/tamodofinulipefakiwasib.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/42712179371.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/vanotemelafob.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/jijinow.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e2acfe26---49881173529.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/palekokigag.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/93084453765.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613759ba77660---7730428502.pdfIn PDF document text
    • http://waypl.pl/upload/File/19083136858.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/fokipebosenugivozeta.pdfIn PDF document text
    • http://debten.net/UserFiles/File/44039751614.pdfIn PDF document text
    • https://protum.se/file/97245973589.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/dutivumuvevo.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109021115566853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dream+apk+downloadPDF 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_off0000b8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B9 10376 bytes
SHA-256: 68b6a74c2536087a63ca09e53beb386982b7e3ab10bafc7daae4033008b7cf5f
font_02_sfnt_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 17108 bytes
SHA-256: 8edcabe877518a570c386729df81874146719748f76d72d096a743c6dfe96fbd

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