Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ff5952f3d4b225…

MALICIOUS

PDF

80.4 KB Created: 2021-04-05 03:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 71a6638bca2696ada98ac6d116e81d63 SHA-1: 4bc70d84e15503bc58188e08f9507c2eff591329 SHA-256: e3ff5952f3d4b225af2f1a9077fb544184f1e73de6b106ebabc31a71900c916d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation scheme designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/wix?keyword=epr+bullet+writing+guide PDF link annotation
    • https://wezenazuzive.weebly.com/uploads/1/3/4/7/134764498/35d35914.pdfIn PDF document text
    • http://cetly.xyz/44906260421ltnwu.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/84433248976ktp51.pdfIn PDF document text
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/domavovipenifi-wikudo.pdfIn PDF document text
    • http://operationhomeplate.com/zisavuxosorumegimutolupl9ino.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/nolesafomeduji.pdfIn PDF document text
    • http://jijesoda.22web.org/64736369881.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/ludusu_bagemesotito_muvisoni_mitepow.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/wutijep_gukizadobexilav_sidonok_vepikewuvusel.pdfIn PDF document text
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/0ea2037dbe7.pdfIn PDF document text
    • https://judagurulo.weebly.com/uploads/1/3/1/4/131438873/vejemevafeterudisuxu.pdfIn PDF document text
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/daxuxegazuniv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_130006cc2806481288c19fb500a44e6f.pdf?index=trueIn PDF document text
    • http://moliposapivar.epizy.com/likaxezovagolibukidu.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_bf58929ee82342e0926a736259200dfa.pdf?index=trueIn PDF document text
    • http://raziwisubuza.rf.gd/conventional_loan_guidelines_for_student_loans.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_d4fe619133cf4f7f9f44037bd7562d88.pdf?index=trueIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_acc040ce20174cda80ebece570084b38.pdf?index=trueIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_054171bbc63f4bd6b843f4e160b8394a.pdf?index=trueIn PDF document text
    • http://vilolosukip.rf.gd/baby_shoes_crochet_pattern.pdfIn PDF document text
    • http://jotowit.rf.gd/best_app_to_paid_apps.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://scripts.sil.org/OFLIn 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_off0000e7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 4928 bytes
SHA-256: 772c18c2b673946914b515fbcd07080d9b3c436dacc7527ab74b4ace492a0b47
font_01_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 11140 bytes
SHA-256: 755314b59080d15c6fe574e490eb490314101cd25837c85104082f1dd5b0c840
font_02_sfnt_off00011ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501