Malicious PDF — malware analysis report

Static analysis result for SHA-256 15812bededdf7252…

MALICIOUS

PDF

76.2 KB Created: 2021-03-21 08:24:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 60c892a0426df28ff717d8d2cc01f9e1 SHA-1: 25204a0ec4793d46e9a7b3c535c518ad29cfacc3 SHA-256: 15812bededdf7252ab9d1afb7ca519b647fbcbf0b0183472c2c71be32bc819b9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, directing to other PDF files. This behavior is indicative of SEO manipulation or a distribution mechanism for further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://fokemale.ru/award?keyword=biodegradation+of+cellulose+pdf PDF link annotation
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/ca4b70d9da298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466166/normal_6051a0dcadf2e.pdfIn PDF document text
    • https://kisisegexorev.weebly.com/uploads/1/3/2/3/132302984/masopanoxavazuzozom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_601b6f5fb8e64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_60212cf6d2301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_603e3d50a189b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_6032485ed63cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424632/normal_5fc7e9e72ca91.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/47967804664.pdfIn PDF document text
    • https://wikoxunorature.weebly.com/uploads/1/3/5/9/135968981/1045548.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/26445927411.pdfIn PDF document text
    • https://renobulog.weebly.com/uploads/1/3/4/4/134464004/furonupofikijomo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_60011d683e68b.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/4418688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_604149a3d8e19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374379/normal_5fc72eda1a426.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxime/88606770879.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/1684741883.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/herbs_and_spices_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/lean_six_sigma_yellow_belt_training_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/social_and_political_philosophy_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/motoriduttori_bonfiglioli_catalogo.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/10435049323.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/kelanawunutixudereni.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/easy_worksheets_for_esl_beginners.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_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 5372 bytes
SHA-256: cba0ed77e79a32cc67f92a36189ca3c4ce99e26e82ae9508f3f8fa81d4258b31
font_01_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 10604 bytes
SHA-256: fedca141892993c950e6a1a1bb7689fceed13a5076f365b618225b802390c4d6