Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b1fca5f71e1dd5…

MALICIOUS

PDF

75.4 KB Created: 2021-03-17 13:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 02afc54ab28c64a621cde9145deb1a7e SHA-1: 29b7daf6f323863dd12fc489a5c0f8fc72103f5c SHA-256: 01b1fca5f71e1dd55b25ee64df7a3a85fae5a663beefd48be78a74933fa00463
206 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. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kuzutuzo.ru/wix?keyword=campbell+junior+high+houston+texas PDF link annotation
    • https://cdn.sqhk.co/zidezofa/4jhOghz/tuvebupowiravesemi.pdfIn PDF document text
    • https://cdn.sqhk.co/levuzivanu/hgHia54/luwokimusarulipiforo.pdfIn PDF document text
    • https://cdn.sqhk.co/xovijanovupu/hfjiAje/89279628676.pdfIn PDF document text
    • http://mizarofu.22web.org/mathematics_project_topics.pdfIn PDF document text
    • http://zakazemakeda.22web.org/honda_3000_generator_spark_plug_size.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/Lid2shi/rommel_afrika_korps_1941.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/jjgiij9/inside_out_coaching_grow_model.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/jfzihVX/66730372478.pdfIn PDF document text
    • http://zakazemakeda.22web.org/baxuraki.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/khiZojb/pixnite_2_color_by_number_mod_apk.pdfIn PDF document text
    • http://gilitomenuxame.22web.org/meburoriwetitasigunutuv.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/hiTxlbi/fire_and_water_restoration_memphis.pdfIn PDF document text
    • https://cdn.sqhk.co/rizakumer/ibigV0O/kavobowolomizusomob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomogas/xujavavananozelunekex.pdfIn PDF document text
    • http://nubimopupugu.rf.gd/scary_granny_house_apk.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_32ece7d8d58648f9baa0370f2cbe2779.pdf?index=trueIn PDF document text
    • http://xejimeve.rf.gd/60443215805.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/moment_js_date_format_timestamp.pdfIn PDF document text
    • http://zabazajalugawez.epizy.com/54633957110.pdfIn PDF document text
    • http://duvirero.rf.gd/best_converter_for_macbook_pro.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_acbdc1958d41466e88850c9abd689d3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/welanisowari/excel_macro_to_create_word_report.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_off0000e745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE745 5424 bytes
SHA-256: b10d2cfdba8a9d75d301e515c6b2ff60b6322f4451e27f582f27f64021b3b2b9
font_01_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 11480 bytes
SHA-256: 7d10062db167385b856478d12b9e564a7a01116968aebe4686c1fbc3605bc58d