Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f867910c4cd095…

MALICIOUS

PDF

67.6 KB Created: 2020-12-23 17:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 941bdd5eaa77763f94690db974c56355 SHA-1: 905d20544d84f0df9d1020b03edd3b4e5fbd9818 SHA-256: 85f867910c4cd095782ce5842d034379012eca242c5f03eee9da149e73b07f7c
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://cctraff.ru/strik?utm_term=black+screen+door+menards In PDF document text
    • https://cdn.sqhk.co/tigufarejeti/fhavghd/87457809686.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/igibgiP/82127193251.pdfIn PDF document text
    • https://cdn.sqhk.co/fokivetezabu/wFhikgc/98284555688.pdfIn PDF document text
    • https://cdn.sqhk.co/tonuviwa/gijijbO/35624194171.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/078be941-bcbb-4262-9cec-e651f67cc93c/11786195987.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/antrenmanlarla_matematik_1_cevaplar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed4aae7-fe6b-4d9b-8346-737b3dc94778/15843976024.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/1798885494.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/34589129199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58e92c8d-0949-4cc4-93e2-8d8632dd2de7/piaget_bilisel_geliim_ku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c836e95-fe97-489c-a69a-beaa38ffb692/marie_curie_high_school_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d95c94-7343-4128-a937-5b3cc39d8c4b/86309873958.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_off0000cd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD14 5200 bytes
SHA-256: bb0c6528a4cf6548ce029e4831d7ec597521f5b53345dfa6c2429c13b8c3f44d
font_01_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 10328 bytes
SHA-256: 20ee3ae767bc56c608318dda02673740d700d60efb89d63383072cdcca93eaed