Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb2e83c4eef4eb0…

MALICIOUS

PDF

80.8 KB Created: 2021-02-22 19:28:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7c71dfd60f19101bdd339dac9fffef52 SHA-1: 097692673e6c58553224156cc46ceae63cc39266 SHA-256: 3eb2e83c4eef4eb09613aec52e62835f8bdede34e4ddcfbea151b1e2688fab1d
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment. The primary IOC is the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/aws?utm_term=lifetime+fitness+la+jolla In PDF document text
    • https://cdn.sqhk.co/xolovagi/jghqPhh/brutal._io_unblocked_games_66.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/igeojiF/best_samsung_s9_s10_free_ringtones_for_iphone.pdfIn PDF document text
    • http://dovulup.iblogger.org/canada_transit_visa_form.pdfIn PDF document text
    • https://cdn.sqhk.co/liregevo/jei9xic/free_video_calling_sdk_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470975/normal_6010626517b76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492257/normal_60144aed340b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416327/normal_5fe29e89868a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446273/normal_5fe3471b22148.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/iLjhaji/iot_experiments_using_arduino_uno_and_raspberry_pi.pdfIn PDF document text
    • https://cdn.sqhk.co/mizopopowaze/hehaagf/fiziradivekiranuvunalovox.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/7xc7APE/uniwars_regular_font.pdfIn PDF document text
    • https://cdn.sqhk.co/denepepunuja/rfifQjg/dead_trigger_2_1._5_3_mod_apk.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
    • http://nutopuderixala.rf.gd/lekamowisekijifepewe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 4624 bytes
SHA-256: ec35c74472955154984cfa4a39d92ce2a20d346bc86e30457dc57df21cf76682
font_01_sfnt_off0000ee39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 10648 bytes
SHA-256: b69750f55a644c1ea5a77116ffe300079db99a5236b11f930665d00ecd326fe2
font_02_sfnt_off000112e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 16176 bytes
SHA-256: fb09c764af2da29dcd1400a6d7077e59cbae054cb92185a2e15c15daf89e4388
font_03_sfnt_off000127fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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