Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc56cb3ed32e6b42…

MALICIOUS

PDF

73.8 KB Created: 2021-09-24 13:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acb3d2b82b5a9402e259c0d022405119 SHA-1: 43428821cb1bed485ef24839481bcf1e7c311a15 SHA-256: fc56cb3ed32e6b4252ff0d5699ea0809c225c9248d954d4cb38ec30e700f3cc1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://mh-gartengestaltung.de/userfiles/file/61519611760.pdf In PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/2812007146.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/zovazamafejojupopewexuw.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/73458524582.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b823b1856cabac0e2b46433e0c6c5750/pidotivikozagogevowad.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/gumaxaxusigorujukujilus.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16146e23fafdaa---5680906505.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/migijipix.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/gimavajurapepisezitajima.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/65254820314.pdfIn PDF document text
    • http://precisao.org/files/files/virujuvaliro.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/ritixobobanukeja.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/58528231184.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/16005452176.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/xesotabirezulopiladu.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/50355001595.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210923145437.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/43469935556.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/ketiwilodojire.pdfIn PDF document text
    • https://samudra99.com/contents/files/radokiratigi.pdfIn PDF document text
    • http://1careglobal.com/upload/files/19801858365.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/43832588762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=piunikaweb+miui+12.5PDF 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_off0000b715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB715 10528 bytes
SHA-256: 2545d7a52bceea63641a649781a1ce019e1f2a7330bb38fbeb2966dd78a29b12
font_01_sfnt_off0000cf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF34 19444 bytes
SHA-256: e39e8df5047f57a51142cdc57d1c8e3a886f9b9766da79b2c484031511f1d421
font_02_sfnt_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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