Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e0bad7c7b63962…

MALICIOUS

PDF

73.2 KB Created: 2021-02-21 02:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: df53a9df87cfba062e98073dc01d124c SHA-1: 5ee8c4d8ef5229721e58fbb780204a879cb1c479 SHA-256: 31e0bad7c7b639623fab96f36c0fb80ef3bdc4c464eec287a16a2b46dbd28a60
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/123?utm_term=the+brain+fog+fix+apa+citation'. This indicates the document is designed to redirect users to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious URLs is sufficient evidence for a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=the+brain+fog+fix+apa+citation In PDF document text
    • https://cdn.sqhk.co/gapekozuwa/9id65ia/xegipanuweduk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460982/normal_600914532f6ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470019/normal_5fcd88475d994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_6018d6ce29eb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407102/normal_5fcdf8c5ce8a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_601bcd728d9fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_5fd3450fa2a10.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/jxziaUP/istumbler_wifi_analyzer_app_for_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366995/normal_5ffa69e7453b7.pdfIn PDF document text
    • https://cdn.sqhk.co/wexazaruko/5lbhbjE/tap_tap_builder_unlimited_all.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fd18f5d894fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fiwujugisijema.epizy.com/ibn_arabi_unity_of_being.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/doninn_audio_editor_full_apk.pdfIn PDF document text
    • http://puwovejivu.rf.gd/balance_sheet_of_amul_company_2016-_17.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_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 5224 bytes
SHA-256: 5e064955d254fad6077919712d033271b2e596ccc270b6de39617f6f29da485d
font_01_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 10380 bytes
SHA-256: 33eb195866d54cf01638620a861f799533fd5b03261cded5610e3dbd287a842a

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