Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d3cd5137e672db7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 06:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2c7ced157327942b006d44ce2ce9af4e SHA-1: 0b77e80b4f460374750251cda0665c92a4318ae1 SHA-256: 7d3cd5137e672db7949e84e9f52d6b266850fcaee644e6ae8f1002ec7a85912b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://queure.ru/uplcv?utm_term=ski+safari+2+apk+mod PDF link annotation
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/70664176815.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/sedan.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/28152971528.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134d67516052---risusoxefipuduxejavix.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/mebobuzokenusa.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/ribuvuvusapazugurozomeb.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/kowilojarajimenawawan.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/duvujamemevaxapat.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/fexebi.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/37256042150.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/39994161643.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/23636812384.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/9247392568.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/50903217296.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/sidobiradon.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/nulimewademunoz.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/fegap.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397a59dd2e4---ninizebekokoleje.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/rujegisegilile.pdfIn PDF document text
    • https://granitnet.hu/editor_up/panamevanolagesemolule.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/menubozilusibotines.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/57958464204.pdfIn PDF document text
    • http://land89.com/ckupload/files/37493437991.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/jemanimetule.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_off0000d595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD595 10568 bytes
SHA-256: 57b316c6931020d22d8de563cdff02ccf8f627aeff93fd67a9fff163e2ab4062
font_01_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 18872 bytes
SHA-256: 02b6896cbd2b531182f4d6d59ee354ab1c3e7c9a30955a9d0725a5c8536d0797

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