Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfafcf6948a487cd…

MALICIOUS

PDF

94.2 KB Created: 2021-03-15 06:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6085f4afbbf4d0d525560bf617561154 SHA-1: 3bdb8a9490c28431d07703d48480eccdd00134b8 SHA-256: cfafcf6948a487cddaca69cdd37cca765c7876ab60e0eee9664b03f7d3626062
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/wix?keyword=osrs+maxed+pure+guide PDF link annotation
    • https://povaxabo.weebly.com/uploads/1/3/5/9/135976235/2489553.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/pupakarilogesimodelufimo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470409/normal_5feea84a18024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_602e295268d04.pdfIn PDF document text
    • https://winulovovitazu.weebly.com/uploads/1/3/0/7/130740324/1070607.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416660/normal_600fdf1f87808.pdfIn PDF document text
    • https://kamedewogivazu.weebly.com/uploads/1/3/4/0/134096977/aac4967f07e.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/fuxenakuverov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bizedesaxifu.onlinewebshop.net/apgar_score_pada_bayi.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_4264fd6e86334a668939e87824d2fa98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/zomomuwela.pdfIn PDF document text
    • https://64db0a9d-d2b7-4705-beb9-75cca7f1d068.filesusr.com/ugd/4c6241_ab307e629d7d4170b4afac6da2c2ee59.pdf?index=trueIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_d67068daad62497bac6a342e7e6b4ff9.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_62bb59f63cbc42b9808bd4b26dc827c3.pdf?index=trueIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_23efe13212544da788ad740a6d14bad8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/accounts_payable_ageing_report_in_excel.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_15eba56d1c0e4965be8d36c18cb4ffa2.pdf?index=trueIn PDF document text
    • http://jomopizemiz.onlinewebshop.net/boximef.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/iliad_book_18.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/50851192841.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CC 5344 bytes
SHA-256: 0a9f4389298be54182c2b17056b761d82e4776c778d3a8654c883fc1f6a781f7
font_01_sfnt_off000144dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DC 11452 bytes
SHA-256: b6504569d78cf1c71092392d9c57dc46f84d789375f11a2fdb0e07c9b1cf4110

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