Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad07e9658e93da67…

MALICIOUS

PDF

74.6 KB Created: 2021-02-22 15:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 08c971f2614c975144155054ce6df56e SHA-1: 7dabbf0193981145741cb9e017c0d9c3efae0ec9 SHA-256: ad07e9658e93da67bdb5f00317e9c040a2eb062aaeb720bb9199c9d8b46930b9
214 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware delivery, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=how+to+study+for+crossfit+level+1+test In PDF document text
    • https://cdn.sqhk.co/wimedizi/9hfXdij/53562642760.pdfIn PDF document text
    • https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/9420799.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/748070.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/WjgidBY/ways_to_avoid_traffic_congestion_on_roads.pdfIn PDF document text
    • http://kulokozataxat.22web.org/nagakafujunume.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/ijib7mW/23780601513.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/edbiens/herpes_simplex_1_cure_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xexegapimuwi/TieJjdX/econfigure_knx_lite_demo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwotewi.epizy.com/titoluloputekisogan.pdfIn PDF document text
    • http://mijuguxugatuk.epizy.com/bard_guide_ff14.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/letter_format_for_request_permission.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/orchestra_video_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/how_to_find_fuse_size_for_transformer.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/windows_10_update_app.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/58782529077.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/sotuvugitaduwawum.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/video_converter_app_for_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/tegabidaso.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/parquet_vs_avro_format.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_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 5072 bytes
SHA-256: 3887942529f937099395ca7321378978ef935a76fe958709e9ec071aa8a8fc94
font_01_sfnt_off0000f9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 10364 bytes
SHA-256: 5f22ce83b5f8553d0496c3b54c2b62e60d9b59f043e61b1ac963e2cdc005db4d

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