Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c21db010619070…

MALICIOUS

PDF

77.6 KB Created: 2021-04-07 19:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8d2cd91ca6804d19d7dcc0acc514e105 SHA-1: 1d444a57e88c83b65c41878ce439132dc9b3419b SHA-256: e6c21db010619070994f9c61069119f44790b31d3c8a53797cf20e7f507dd326
66 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate malicious intent. The document contains a large number of embedded URLs, many pointing to disposable or suspicious domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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/wix?keyword=tiber+river+google+maps PDF link annotation
    • http://fawanajaxape.22web.org/rutoju.pdfIn PDF document text
    • http://degitowexara.iblogger.org/punctuation_marks_rules.pdfIn PDF document text
    • http://ionatr.fun/alamo_colleges_staff_pay_scale_2018axtky.pdfIn PDF document text
    • https://gifedoku.weebly.com/uploads/1/3/4/2/134234788/b5d4591ae8455.pdfIn PDF document text
    • http://workshop-fb.ru/54539669013sko0z.pdfIn PDF document text
    • https://fobizolavavoka.weebly.com/uploads/1/3/1/4/131406440/7c7225.pdfIn PDF document text
    • https://vavinaxedekofew.weebly.com/uploads/1/3/0/9/130969509/1347137.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/E7Midie/mecanismo_de_accion_de_los_antimicoticos.pdfIn PDF document text
    • https://sagokawosulo.weebly.com/uploads/1/3/4/9/134904643/jatabobukekepi-novavojeve-tinunenedon-siwometoka.pdfIn PDF document text
    • http://supportcopyright.net/firefighter_hat_craftkkb6a.pdfIn PDF document text
    • http://lavkavkusa.store/42058400106ll7pc.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/iageP9i/mortal_kombat_xl_vs_11_cual_es_mejor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e61031b-d8b9-41d8-b999-d034937ca1c2/que_son_los_tipos_de_organizadores_graficos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3a08b73-17e9-47bd-a529-48608fe086b1/hampton_bay_ceiling_fan_remote_installation.pdfIn PDF document text
    • http://peguretunemidom.rf.gd/hyundai_avante_xd_2020_manual.pdfIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_987a02ff757c4618944a860e7a04c1f8.pdf?index=trueIn PDF document text
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_b00568efc0794f39bad077bf8093562b.pdf?index=trueIn PDF document text
    • http://fuzadakeju.epizy.com/34658435437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a3d295-93d0-4659-a53f-90511876720d/30522628633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ea522b-9ad2-487c-a5c7-38acd3b005dc/wukivividojewesejado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69aa2971-fdb3-4d92-96e3-58d4a852df0c/plantronics_backbeat_go_810_wireless_cena.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_f35ddcf607a3471eaa1a484772e1ff9c.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_226cd4d2888a44069175c5201c5458af.pdf?index=trueIn 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_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 5288 bytes
SHA-256: 1235cb2f0f05e4979f70ab8ee4e2a51c8c8cc9c0a2591d6df9046c429ff70af9
font_01_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 10404 bytes
SHA-256: 592036b1017236bdb7814fd4b93f7982a35c5ca12c53b34a4fd91ebc11006d74

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