Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4a72eaf1777fe1…

MALICIOUS

PDF

86.3 KB Created: 2021-03-24 10:25:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: df75e20c924ffb46c7fc3124431fa947 SHA-1: b36a568175857107ec180d73413c5084d5ce4f97 SHA-256: 0b4a72eaf1777fe1633eec39909af32f4c3311564f13e66d66dfa95d8c441c54
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, characteristic of SEO spam or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/wix?keyword=maximizing+your+potential+pdf PDF link annotation
    • http://nitesufi.sportsontheweb.net/what_is_the_symbol_for_nasdaq_futures.pdfIn PDF document text
    • http://edayafar.xyz/texusuxinalojnxl1s.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/6918991.pdfIn PDF document text
    • https://xekejinobo.weebly.com/uploads/1/3/0/7/130776350/8440230.pdfIn PDF document text
    • http://prostosite.site/release_planning_templategspy7.pdfIn PDF document text
    • http://xagigusutop.iblogger.org/bosch_500_series_dryer_manual.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/16159215045.pdfIn PDF document text
    • http://idealicaitalia.website/passport_size_photo_maker_online_free_downloady2870.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/meaning_of_social_development.pdfIn PDF document text
    • http://mebelrostov.ru/83560506870p0w49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/38279284915.pdfIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_9d927979aa8e458eadc59cb412cbce65.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_dec24ff25d894621a7ed173b7443312f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/xutemerovenojudixu.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_fa315e0794644a288f0c26ac2a8b15cf.pdf?index=trueIn PDF document text
    • http://jaxegowanav.rf.gd/wenuvekaxuvonisaxinupajuj.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/gagowuj.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_19821ce4b20a426280f7f2e37c0fe4f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/69167716499.pdfIn PDF document text
    • http://boxibuwir.epizy.com/the_mistborn_trilogy_goodreads.pdfIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_2b20df65cb2645ec9d2357a26ef2b766.pdf?index=trueIn PDF document text
    • http://degedudu.rf.gd/monthly_expenses_excel_sheet.pdfIn PDF document text
    • http://didaduxazej.epizy.com/wudopatixekalelunemez.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 5292 bytes
SHA-256: afe3f9993363507e7665df7a8b5153c918367eae8785cff91f8bc9f1dd33d525
font_01_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 10672 bytes
SHA-256: 54112f8b8c4fe338b074b025cd37d51687ebaaa55d436acd4f16f9305daa78d3
font_02_sfnt_off00013d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2