Malicious PDF — malware analysis report

Static analysis result for SHA-256 91baf8407bd21fe6…

MALICIOUS

PDF

79.6 KB Created: 2021-03-21 10:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 30657b1f3a163b30992966f1fcca362a SHA-1: 8e43509bc9b396887cb4d39acc1825f3e257bfb1 SHA-256: 91baf8407bd21fe6b0766ff908c0820b9fed7f02312ee41993a405af5e57dad5
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9993

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://crophysi.ru/award?keyword=tipos+de+energ%25C3%25ADas+alternativas+pdf PDF link annotation
    • http://bitcoins-profits.com/barrons_gre_21st_edition5le0x.pdfIn PDF document text
    • http://dietnatur.fun/acc_aha_hypertension_guidelines_20197pvrj.pdfIn PDF document text
    • https://cdn.sqhk.co/vomofizog/eAibihy/arteriovenous_malformation_radiology_brain.pdfIn PDF document text
    • https://viwekaxirudadax.weebly.com/uploads/1/3/4/7/134700275/a6fbe691bdd.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/LhgigZX/wozojalesimatapegibaga.pdfIn PDF document text
    • http://canlisohbetim.net/flexible_dieting_calculator8nywh.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/xarolejete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_5fd18db05f976.pdfIn PDF document text
    • https://wixolovab.weebly.com/uploads/1/3/0/7/130776385/dezisuwaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_6015f53f34204.pdfIn PDF document text
    • https://soliduratop.weebly.com/uploads/1/3/2/3/132303261/xowojovagijoj.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • http://copyrights-notices-helps.com/21797390761cwmu8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_604cf7b73fec0.pdfIn PDF document text
    • http://rp-youtube.fun/269699890964wcb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_6009cb3721bbf.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/dUvoqhc/massca_pocket_hole_jig_set.pdfIn PDF document text
    • https://pukuxenusafo.weebly.com/uploads/1/3/4/7/134711282/sadexewewudodude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_6026cbe3bca4f.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/3d61c89f-b665-46f1-aa23-2f938eb9ff4e/the_scarlet_letter_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b721eb-ebde-480e-8697-f8f47bf3c03a/mifuzonoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9764acbf-314d-4ce5-915b-073d13b82a44/pretty_little_liars_reboot_original_sin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7d5563e-18b0-4509-9d71-a0042a8d0563/bukekagemagepajorukefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f96ff9-e57f-4dfc-94ae-7686529ab5d5/what_is_calorie_in_chemistry.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_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 5272 bytes
SHA-256: 6d03ac603032bed9b3751a0ab62929a2dcc0cb03875ceed359a2bc0961b00b8d
font_01_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 11948 bytes
SHA-256: f45afa3789a49a0ce7e4b87fbe04cf81f67a120246edb3d430f35d70cff35754