Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d75a8767a6e40e…

MALICIOUS

PDF

100.1 KB Created: 2021-03-11 06:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ca041501b0ade765227616b34badac31 SHA-1: 21a049e7c8982ff0deb5845e2a7bc3dc609f6130 SHA-256: 52d75a8767a6e40e850dbb075bff9787e3956ea8083b61f9899e8461303c26df
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely serve as lures to malicious sites or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=final+fantasy+7+remake+report+15 PDF link annotation
    • https://denuxikunoleluj.weebly.com/uploads/1/3/4/0/134018299/maxivamojepebakin.pdfIn PDF document text
    • https://rirosivipoxutu.weebly.com/uploads/1/3/2/3/132302830/zubid.pdfIn PDF document text
    • http://accueilcmb.com/spring_resttemplate_transfer-_encoding_chunkedhb9r4.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/galuzunumapuruv.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/nikon_dx_vr_battery_charger.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/wahl_lithium_ion_duo_premium_hair_clipper_and_trimmer_kit_reviews.pdfIn PDF document text
    • http://techanomic.com/18075373182m976z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_6035b27e1d296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450338/normal_602af018581d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452626/normal_5ff5f3308f189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_5fe8acf984ad6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_600d0bbc21d45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_3fcf82c62f21434cb0e2bd2e32414167.pdf?index=trueIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_f20d44a6f83c4604a33e900fcfdb84a9.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_aecb2b63cae04a25a2d201d03ee83e1b.pdf?index=trueIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_2be89497442645ddb997dc983cbe52c4.pdf?index=trueIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/tivo_slide_pro_remote_learning.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_1da692f75ac440c98b2edb21709ef3c9.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_252834a898d94b55a19a2128f14dabcd.pdf?index=trueIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_464d78c70af7417c860567544fd67e1d.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_off00014b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B18 5424 bytes
SHA-256: 5d695238a7d748c57464dfdb0d754622333a87dd50658e1ddec4a09045b78e2a
font_01_sfnt_off00015d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9B 10900 bytes
SHA-256: 4e596168047ce2e6d34febcfe0041beb33597dd8f2d43de4cb54e9d715b0d47b