Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3612b22c1e7740…

MALICIOUS

PDF

77.9 KB Created: 2021-04-04 14:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 85f5aff67ddc84503f6df4842ac4dfef SHA-1: dd96c7288c77c779ac1bd2406b0eec7fb0f07c54 SHA-256: 2d3612b22c1e7740b7abede39a9d34759d58c74a531ddc524756bb15506f0311
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pelibifir.ru/strik?utm_term=health+and+safety+training+for+childcare+providers PDF link annotation
    • https://wajutuba.weebly.com/uploads/1/3/4/6/134656264/jobulemozom.pdfIn PDF document text
    • http://navoviragumaviw.22web.org/al_quran_tagging.pdfIn PDF document text
    • https://rifuvosibimav.weebly.com/uploads/1/3/5/3/135383082/doratutafidab-wegifo-sirigimasu.pdfIn PDF document text
    • http://dufapun.22web.org/calendario_2020_por_meses.pdfIn PDF document text
    • https://biwimukapol.weebly.com/uploads/1/3/1/3/131398517/nibasumoxedexu-vojawupubidaj-xinozimaxigim-sumovov.pdfIn PDF document text
    • https://moxeguzivega.weebly.com/uploads/1/3/5/9/135965209/rimodev.pdfIn PDF document text
    • https://wapaberupuz.weebly.com/uploads/1/3/5/3/135397773/6102349.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
    • https://uploads.strikinglycdn.com/files/7fbc3b69-e89c-43a4-8d51-1055f6af291e/what_to_cook_for_dinner_in_air_fryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1839fea-bbc4-47b8-b906-494d4b3bc0d4/batunapitogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e023f489-7bf6-4609-8379-78ac200e45fe/93593643477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/782465b0-e4e6-4196-8020-59cfe48f767d/weight_lifting_program_for_beginners.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_94cd0a8c91fe4394a1d0fb848a8a3d45.pdf?index=trueIn PDF document text
    • http://zotodim.epizy.com/chemistry_basic_formula_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffc8f89-d222-42fe-b596-9d0cab20ea44/amc_8_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d5563e-18b0-4509-9d71-a0042a8d0563/bukekagemagepajorukefa.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/free_sample_sql_database.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/kigesabiwemotumezovebefe.pdfIn PDF document text
    • http://releboxodaw.rf.gd/37388316633.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_d671f6f71f1541e6b929386b01f17bb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6105339-54de-448c-90af-0e856bceccc1/can_you_get_imovie_on_an_ipad.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/mudoxuruvorujoxadoje.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_66efe364c764421baf5005a340b1ab1f.pdf?index=trueIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_b4ac92a4555e49b28ad390e6eda40486.pdf?index=trueIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_55cd49a287d84a828feac04042cd1b2a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 5328 bytes
SHA-256: 897c0140cba554c4c450e12a15a1ee7ee23400f0a084f8c68167330ccc615de1
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 10728 bytes
SHA-256: 28ecb306ce4af6e60faa68c870233a648fff094dce469ec7280991667c6dc1ac
font_02_sfnt_off00011b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333