Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b236011c88861ff…

MALICIOUS

PDF

79.6 KB Created: 2021-03-15 10:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e392094fce63975858a1a0ea22474d4d SHA-1: e3e733c8a28e742eb50f31f9d333fffe5292fc41 SHA-256: 8b236011c88861ff0f1bbbd1821db8e3c135c75d700642e7708e20d8f07331a7
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/123?utm_term=apa+format+stands+for PDF link annotation
    • http://sudilufib.getenjoyment.net/dbx_166xs_owners_manual.pdfIn PDF document text
    • http://fifixerabola.iblogger.org/trastorno_afectivo_bipolar_definicion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_600b3d61cbd86.pdfIn PDF document text
    • http://watogoda.mypressonline.com/80835863914.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448545/normal_6007c64376b37.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/cantigas_de_escrnio_e_maldizer_caracteristicas.pdfIn PDF document text
    • http://modalidetefid.iblogger.org/cholangitis_guidelines_uk.pdfIn PDF document text
    • http://nutejujaxi.66ghz.com/a_current_affair_reporter_lauren.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/skyworth_tv_review_malaysia.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
    • http://ziwebizivag.epizy.com/lejozomipopozud.pdfIn PDF document text
    • http://sapifux.epizy.com/environmental_impact_report_negative_declaration.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_38b7af15ca4a4ebc8bbd40584c774105.pdf?index=trueIn PDF document text
    • http://sarososibi.rf.gd/zutezavuwo.pdfIn PDF document text
    • http://jafimogapevov.rf.gd/88876612049.pdfIn PDF document text
    • http://xuduzunubedi.rf.gd/sony_vegas_pro_16_keygen_free.pdfIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_4625dfecb547498394543411341ad4d8.pdf?index=trueIn PDF document text
    • http://xugonowelimije.epizy.com/goduzab.pdfIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_e9c39d7bd7114ebd855fa51c72c53736.pdf?index=trueIn PDF document text
    • http://bogalibamadom.myartsonline.com/free_kindergarten_math_worksheets_counting_to_20.pdfIn PDF document text
    • http://sesukunijekoti.epizy.com/51909484421.pdfIn PDF document text
    • http://gokozir.rf.gd/dogoremipizesug.pdfIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_a5c81e20f2fa4ce7af3a171584502db9.pdf?index=trueIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_0346121748fb4c1fab95246b0ee13ba5.pdf?index=trueIn PDF document text
    • http://tipuwexo.rf.gd/basics_of_electrical_and_electronics_engineering_ebook.pdfIn PDF document text
    • http://fuxazulofonu.epizy.com/how_to_use_vax_dual_power_carpet_washer.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_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 4764 bytes
SHA-256: 0551ae769efa7e2c1dd044f966b5f7641a6b62de94b5bf52160baec320937ace
font_01_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 11000 bytes
SHA-256: 1151333b54a1cfc2403f75475f598e7aad3a441626a286f6aea2bf87706d34ed
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378