Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d36c496110c069e…

MALICIOUS

PDF

76.1 KB Created: 2021-02-20 17:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fe50355c9957e5e6584024cc0629bf6e SHA-1: fccb71184446be296d65a4c531d41fac09334407 SHA-256: 1d36c496110c069e853338e4973bdaecdbab8e9554293f096f5a6018d857688e
136 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded invisible links that redirect to a suspicious domain hosting a PDF file, likely a phishing lure. The document body, though heavily garbled, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. No scripts were extracted, but the presence of external links and the overall detection profile strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://leonvi.ru/wix?keyword=should+i+delete+temporary+internet+files PDF link annotation
    • https://cdn.sqhk.co/fuluzagile/e2gfTZ4/35613851187.pdfIn PDF document text
    • https://cdn.sqhk.co/riteximeras/jWO5WCy/minecraft_dark_forest_seed_1._14.pdfIn PDF document text
    • http://aires.fun/ford_car_mechanic_near_meyuqz5.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/iegihie/widex_rechargeable_hearing_aids_reviews.pdfIn PDF document text
    • http://managerprogram.live/634318190285qs56.pdfIn PDF document text
    • https://cdn.sqhk.co/derepinejabi/jfbje2o/77911260116.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/qdXigb3/52243353736.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bewibiwat/fagekulexejozazo.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/darth_vader_wallpaper_android.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/annual_general_meeting_minutes_template_singapore.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/proforma_invoice_templates_excel.pdfIn PDF document text
    • http://matufuw.rf.gd/score_hero_hack_ios_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/business_plan_template_for_online_retail_store.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/75172832098.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/rubugano.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/13902840657.pdfIn PDF document text
    • http://sewexojin.rf.gd/fupiwufinuganiwilazepokuj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 5368 bytes
SHA-256: a36d9ad03480c052074a691821feb6c9d7e0bc138ad0880f5214697b82d04e6b
font_01_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 10208 bytes
SHA-256: ed8562923676ba2a069373ba910d242ff6750fb7fcc958cef6032cbc4f3d8d39
font_02_sfnt_off000114ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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