Malicious PDF — malware analysis report

Static analysis result for SHA-256 870cb8ad75465fad…

MALICIOUS

PDF

73.3 KB Created: 2021-02-08 22:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bbc6139aac1bd16b2b42c71bc05ccecb SHA-1: c80633cc1c71872e38a11b4feb81efcd0953d7fa SHA-256: 870cb8ad75465fadda856838875334c4673da8703eac6810363537fa1f3522cb
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malware delivery. Although no scripts were explicitly extracted, the presence of malicious URLs and the document's deceptive content suggest an attempt to trick the user into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=principles+of+enzyme+catalysis+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4372673/normal_5feb96f8d313b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_5fd2f9d60bb45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377095/normal_5fcb6a5903a90.pdfIn PDF document text
    • http://persequen.com/68073845769zkl6m.pdfIn PDF document text
    • http://epipog.com/sofezabiruxubzmrvw.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/YlihhdU/cake_designs_for_40th_wedding_anniversary.pdfIn PDF document text
    • http://christinaanddavid2019.com/guided_imagery_meditation2oze4.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/jfiehd3/diaphragm_pain_in_back.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376086/normal_5fe1459917f3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_5fc8e0ce7b984.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502567/normal_600171e620c19.pdfIn PDF document text
    • http://salebox.shop/zuwivabefafegimekivclzd.pdfIn PDF document text
    • http://yogait.space/foragidelebuzudak4l8jv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_5fc5b0b0b9a1c.pdfIn PDF document text
    • http://helplnstagram-confirm.com/bemefux4vj9r.pdfIn PDF document text
    • http://usmileofficial.site/vsco_apk_full_packjnjzy.pdfIn PDF document text
    • http://ing-cliente.com/rinetudowefatonusewofefu7di54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 5452 bytes
SHA-256: 1137ee30417693922571272096fb77696233198294241f537183a6bfaebdd984
font_01_sfnt_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 15440 bytes
SHA-256: f6d7550287d3737d44eabc8a37a156a5d48f278d23fdb966a5cac2cf49595661

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