Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4efa0f8632db66…

MALICIOUS

PDF

89.9 KB Created: 2021-03-17 18:58:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59913a39aeaadbfca4ba9affc2c005e1 SHA-1: b3e9ac6b50c651c202ddf8b61d5cb4421226ea41 SHA-256: cf4efa0f8632db66b0f16e240cc369eceee2d6be5052ea0ba0132510f7d38b94
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a lure related to Cambridge exam materials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ponafet.ru/award?keyword=cambridge+exams+extra+pet+student+book+with+answers+pdf
    • https://tafugamukizigip.weebly.com/uploads/1/3/0/7/130775106/850269.pdf
    • http://kubikox.iblogger.org/zulebufekifal.pdf
    • http://wazasutosas.iblogger.org/angry_birds_mod_apk_2.pdf
    • https://cdn.sqhk.co/folukize/ixgiLhX/squirrel_bomb_drink.pdf
    • https://cdn.sqhk.co/lilomovetum/jgk5ggu/uninstall_android_messages_update.pdf
    • https://cdn.sqhk.co/momujolo/MYMHihz/zinirivurejakoxogosusimoj.pdf
    • https://cdn.sqhk.co/feripamapuv/jiFDgjO/american_football_prediction_app.pdf
    • https://povejuzulegaje.weebly.com/uploads/1/3/5/3/135301343/4338332.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sirilagewuga/89735015685.pdf
    • http://tugepujato.rf.gd/budikuwokudugo.pdf
    • https://s3.amazonaws.com/wizuluworafid/facetime_app_for_android.pdf
    • https://s3.amazonaws.com/vunizi/firexubowogawakiz.pdf
    • https://s3.amazonaws.com/gurupixabogivaz/best_top_load_washing_machine_consumer_reports.pdf
    • https://s3.amazonaws.com/setigafat/gowirotujetuxizikuzerexim.pdf
    • https://s3.amazonaws.com/risisipajole/nenojexipasekelefaxelig.pdf
    • http://fulawumobolofog.epizy.com/15047337991.pdf
    • http://karajifaderiwow.epizy.com/best_balance_sheet_reconciliation_template.pdf
    • https://s3.amazonaws.com/tiduro/87534338475.pdf
    • https://s3.amazonaws.com/vabedafozo/66326836310.pdf
    • https://s3.amazonaws.com/tarizirefevifab/41943711522.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000130b0.bin
84ded29ff15bbfedfebd8ba5578c22b82fa041412c70bf4a191cb8080763ac5c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x130B0 23304 bytes
font_00_sfnt_off0000f1ab.bin
66e0532b2d289c58a48c851acb6e5d13a30f6bee05f148314796c466e8ae2edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 5692 bytes
font_01_sfnt_off000104e7.bin
8dad370172f60bf1cbaa5fbfa123d3a3b210b5b148875045c420f28fd288098d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 13612 bytes

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