Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b16f331c9bea48…

MALICIOUS

PDF

81.4 KB Created: 2021-04-01 00:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 917dc008bf90627f6bee92eeba674cb4 SHA-1: 5f5b3da200fd24b45d2096df426662c89d0b8bf3 SHA-256: 91b16f331c9bea48ede781fbd350430f8a0ba4fc74302554e063e4e8f99b5270
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirectors, indicating an attempt to lead the user to a harmful site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of malicious URLs is a high-priority indicator.

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://yafferge.ru/123?utm_term=calendario+hebreo+5779+pdf In PDF document text
    • http://muzibatixabu.mypressonline.com/mla_citation_style_guide.pdfIn PDF document text
    • http://tavegumata.sportsontheweb.net/kakuro_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/momebuman/3iiQgjh/2019_calendar_printable_template_word.pdfIn PDF document text
    • http://copriyghtconfirmed.com/the_great_stupa_at_sanchizlkaq.pdfIn PDF document text
    • http://goldotzyv.ru/honeywell_hcm_350_humidifiern0rtd.pdfIn PDF document text
    • http://martakkord.ru/81952597149f7ieb.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/52826224881.pdfIn PDF document text
    • http://shop-profildoors.ru/zutulorg39jc.pdfIn PDF document text
    • http://rulajamizap.getenjoyment.net/military_inc_ayesha_siddiqa.pdfIn PDF document text
    • http://itravelgr.com/safosimetezejulexivulawj1cnw.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/UXggiaV/zombie_swat_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/ifigggA/top_music_player_app_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xedogigiloli/igcihTl/doctor_on_demand_stock_price_today.pdfIn PDF document text
    • http://tehnikator.ru/alcohol_phenol_and_ether_target_class_12yiekc.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/jbhgut7/49346338836.pdfIn PDF document text
    • http://begetus11ppz.xyz/sowuluzuvokek5z.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/fajonubinomeder/real_ghost_story_in_hindi_fear_files.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/8416544667.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/case_580l_backhoe_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/33455384663.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_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 5356 bytes
SHA-256: 930ab06bf419e1bb588c52f4f4fc1df331ac273c38102a2d69e7cc8fa11a48f2
font_01_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 13536 bytes
SHA-256: 1819bbff93038da0555f78cb8250a9cfb0296db8872289f0bda1fd4863987590

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