Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed85232b49d9a6c…

MALICIOUS

PDF

76.0 KB Created: 2021-05-15 15:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 83494a3ea1342bc9e36aaeda40822ada SHA-1: 12530ef2ed3efe42149fd38693e6efe454733bc4 SHA-256: 3ed85232b49d9a6cdb640b80e5f68a2931753faa2d2e2f14e5bcc4106ecd7402
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/strik?utm_term=how+to+check+my+google+cloud+storage PDF link annotation
    • http://salearea.pro/903244186226ggzx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_601a61f69ffb5.pdfIn PDF document text
    • http://tiwujatujoput.mygamesonline.org/litajazexom.pdfIn PDF document text
    • http://watulexop.iblogger.org/best_mobile_phone_reader_for_android.pdfIn PDF document text
    • http://copyrightsupport-ig.com/how_to_define_my_religionaj44u.pdfIn PDF document text
    • http://parovosi.mygamesonline.org/5th_grade_math_practice_test_common_core.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_606ceb74a33f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_603099e197a17.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/alchemy_user_manualv8v3i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450247/normal_60604cb9d32f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusebirenox.myartsonline.com/40270636384.pdfIn PDF document text
    • http://zenutetuzobo.epizy.com/ahriman_s_prophecy.pdfIn PDF document text
    • http://nuxotupasi.rf.gd/divad.pdfIn PDF document text
    • http://fakeloj.rf.gd/8730768172.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/geometric_probability_problems_and_solutions.pdfIn PDF document text
    • http://tapukov.rf.gd/92808764576.pdfIn PDF document text
    • http://tupikodufalapa.epizy.com/luxolisa.pdfIn PDF document text
    • http://jarujoburisuw.rf.gd/lofozukalisadixa.pdfIn PDF document text
    • http://keretagukuvar.epizy.com/where_can_i_find_the_disney_princess_filter_on_tiktok.pdfIn PDF document text
    • http://vetozidute.rf.gd/simejisopewaxubowixax.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_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 5572 bytes
SHA-256: 3b75b15b606dc6f1f1e45b659c85d09ed1bb9fa8133c0f2391b3ec3943081446
font_01_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 10488 bytes
SHA-256: 180c88d108c22ed5f9cc6a2a5733ceca41d1f2f0b42e829314f87a9455e2840f

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