Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5a4f621fda94ea…

MALICIOUS

PDF

68.5 KB Created: 2021-04-07 20:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 554a86e60fbc2bded19dcea5ff25bd27 SHA-1: 5ccd83d029ddb7805e2d1be2a5116efc5936a490 SHA-256: 1c5a4f621fda94ea52abff1ac52d9b36451c831539d7a1b203baac39d56bf9ea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. One prominent URL, https://mezovuduw.ru/wix?keyword=chapter+12+review+modern+chemistry+answers, suggests a lure related to educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=chapter+12+review+modern+chemistry+answers
    • https://cdn-cms.f-static.net/uploads/4373998/normal_6069c2f25bf04.pdf
    • https://cdn-cms.f-static.net/uploads/4483839/normal_604f2c4a27edc.pdf
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/senaferesor_petefe_xiwowu_fubedu.pdf
    • http://jajuviramigawo.medianewsonline.com/benefits_of_studying_abroad_essay.pdf
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/9254174.pdf
    • https://zumaninerotuz.weebly.com/uploads/1/3/1/6/131637595/samesip-juvumuleravo.pdf
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/b816bdb4.pdf
    • http://neletaparufo.scienceontheweb.net/introduccion_a_la_arquitectura_bioclimatica.pdf
    • https://cdn-cms.f-static.net/uploads/4465024/normal_6061347467280.pdf
    • https://bukajovogasis.weebly.com/uploads/1/3/4/3/134340533/da2de4386664867.pdf
    • https://cdn-cms.f-static.net/uploads/4457881/normal_60622097a671c.pdf
    • https://static.s123-cdn-static.com/uploads/4391001/normal_5fef6166acab1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_81bdf5cc9dde4b2a854ab6661df8a4ea.pdf?index=true
    • http://zujawuka.epizy.com/annotate_onenote.pdf
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_6c06ef8d1c964e61bdb0bd1504887691.pdf?index=true
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_44b9dcfaf62b47088f59e093cd3af1b0.pdf?index=true
    • http://danidagibi.epizy.com/dixegogewunevag.pdf
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_8f2f36371f434d98b9832c25e77f32a6.pdf?index=true
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_7eb4786844af4f3fad39589a0f6a1646.pdf?index=true
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_11d8915ec0d143c588f0d5901925864b.pdf?index=true
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_4c4405af80244836beb1dc1a8cbf342c.pdf?index=true
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_aae866b7b2e3487e8d5c198282e35d4f.pdf?index=true
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_4a9bf9a05c294b8abbdd0d65af61b0b8.pdf?index=true
    • http://pofijiserige.onlinewebshop.net/kazodi.pdf
    • http://rakijojovisu.rf.gd/ignoring_base_rates.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf6b.bin
bf1e6e34c6a7fdcf05229d4020d8bae7813f2b456d642ca70fb82a7740075a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 5624 bytes
font_01_sfnt_off0000e279.bin
fbb141715722a07c8a2cfdb07dccc2c5d06abc9c10895ab96f01aa299ceeda08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 10256 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.