Malicious PDF — malware analysis report

Static analysis result for SHA-256 04af7148ed99de55…

MALICIOUS

PDF

72.5 KB Created: 2021-01-29 03:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 28f7e3a7d8decd883d7486e1380535f5 SHA-1: 923e6225501c1412d9995d8ccad229d6d73477ad SHA-256: 04af7148ed99de55602f3806edc2bd050e50a871cf4a6c633c9f7c77ed5c8a3f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=what+is+sws+mean PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402720/normal_5ff9a8dd1f2dc.pdfIn PDF document text
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/5551700.pdfIn PDF document text
    • http://beveram.66ghz.com/verb_to_be_exercises_questions_and_answers.pdfIn PDF document text
    • http://hookup756.fun/free_ringtones_for_iphone_8_appuf86h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453908/normal_5fe3dbd0a44f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_601154a9a9fdb.pdfIn PDF document text
    • http://avit0.cc/506772250475s37t.pdfIn PDF document text
    • http://zinuxuf.22web.org/bupuwamibebukunigeka.pdfIn PDF document text
    • http://mishabelle.ru/391040760548n7be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421615/normal_6003ad12614ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408471/normal_6006f6a33aa83.pdfIn PDF document text
    • https://nefatalij.weebly.com/uploads/1/3/2/7/132740339/9992175.pdfIn PDF document text
    • http://fredo.run/ashokan_farewell_sheet_music_free4dpir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxibuzejapise.epizy.com/inshot_video_editor_paid_apk.pdfIn PDF document text
    • http://vufuxit.epizy.com/symmetry_worksheets_kindergarten_free.pdfIn PDF document text
    • http://rigirulame.epizy.com/7348014186.pdfIn PDF document text
    • http://keputeka.epizy.com/5_day_notice_wisconsin_template.pdfIn PDF document text
    • http://zivigujuvove.rf.gd/chrome_browser_extensions_android.pdfIn PDF document text
    • http://dalezogidaxi.epizy.com/ravens_injury_report_2019_week_3.pdfIn PDF document text
    • http://verirajoxa.epizy.com/45923745075.pdfIn PDF document text
    • http://zavinijasa.rf.gd/regret_letter_after_interview_template.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_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 4900 bytes
SHA-256: cfcfd3729cb2b71a4d8a006476f3ad4ba39b8a5ceb88a0eeb67a1c2ed99c9e00
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 10516 bytes
SHA-256: e079a39cd4030d4d96cb0870229a07191d9f5a263133a9a628f4b49a158ca921

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