Malicious PDF — malware analysis report

Static analysis result for SHA-256 3915825c72ce2d9c…

MALICIOUS

PDF

165.0 KB Created: 2021-06-04 21:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 99d71664edaca56b59e470d92523d6c4 SHA-1: e996a9c44013d4a71f35045fb042c2d3897c793a SHA-256: 3915825c72ce2d9cb2c684f1b194937a6c217d33812d6eb1525889ae51f0d65f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9987

Heuristics 5

  • 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 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://philabc.ru/pbw?utm_term=digital+marketing+dave+chaffey+7th+edition+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426261/normal_6058e791a32d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415964/normal_5fcebec0766b5.pdfIn PDF document text
    • https://susotavawo.weebly.com/uploads/1/3/5/3/135325365/kadedos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470408/normal_600fc8333028b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415544/normal_605d97495a604.pdfIn PDF document text
    • https://jikevisanudopud.weebly.com/uploads/1/3/4/0/134017539/7316162b83fa7ad.pdfIn PDF document text
    • https://wisukemebo.weebly.com/uploads/1/3/5/9/135962546/a9ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484818/normal_5fd6ec935f6c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408004/normal_602ce34888e36.pdfIn PDF document text
    • https://xoredanixeg.weebly.com/uploads/1/3/0/8/130814516/mesifokebelu-metofiki-kaxevifawise-farad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503050/normal_5fd124863695f.pdfIn PDF document text
    • https://zinibolaribile.weebly.com/uploads/1/3/4/7/134717470/5853555.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4457604/normal_60b5d13be30b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_60b978b6994b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420037/normal_5ff22d31ad32f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449788/normal_5feb54de59a80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_601a17b75cf99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nafidob.pbworks.com/w/file/fetch/144602982/the_house_on_mango_street_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a7beb2-6553-4f90-8c77-212d98b54943/76938107787.pdfIn PDF document text
    • http://wepoline.pbworks.com/w/file/fetch/144441105/12803284413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9b9984-1010-42c7-81ae-a0838c5e3898/how_to_become_a_spanish_medical_interpreter_in_california.pdfIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144601536/2nd_3rd_conditional_exercises.pdfIn PDF document text
    • http://xivoxibuza.pbworks.com/f/tedovudawowabobajogedevof.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144415146/what_is_the_greatest_musical_performance_of_all_time.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23308 5788 bytes
SHA-256: c106fe67b3d49dedcf59c926fb2afe72cdcec40a1e3a1a6afb046123384b7a35
font_01_sfnt_off000246c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x246C8 12616 bytes
SHA-256: 64ff99249c2d25b197cfe7b866ca368fa199c7a25b3145b36aea180ca15d0f64
font_02_sfnt_off00027057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27057 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d