Malicious PDF — malware analysis report

Static analysis result for SHA-256 037e3fa19770aa79…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 22:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 975a3771fc428b5e8dac95d93a64c3af SHA-1: 0d98dffd51f082cec8742e05effb6b7c817339ec SHA-256: 037e3fa19770aa79c4160567c2e45c49018d94b9a934d9eea2791f0631129f01
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of hosting many PDFs on disposable domains, suggesting a link farm or distribution network. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for execution, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://banner-ever.com/ckImg/files/79867539977.pdf In PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/pesanatosisuzuretunebon.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/23132681438.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/63915183590.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/wegoniro.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/denupizisarugewumuvexu.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/zumekupotojukivu.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/92356280798.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/gexizanemeru.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210911015828693481.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/10447683567.pdfIn PDF document text
    • http://northcity.rs/slike/files/kufisa.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/44357302969.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/posugo.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/90575218494.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/dejigurerudelegitene.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc2fdf5de---taligejixel.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/kuxurufinidaferelovirumit.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/61909924338.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/fagugawujid.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/radutogukotubokatopus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wireless+display+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_off0000cf26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 18832 bytes
SHA-256: 83d60e5b005d84fd2482dab2e456fbc8382f01ebbd3a92ff633a05a845f34f54
font_02_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 10572 bytes
SHA-256: 048c2ba1bfaef3571ab09e6243d21dd66e280d3b8a5b9cf699ff3169e7b4fba5

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