Malicious PDF — malware analysis report

Static analysis result for SHA-256 4771b2600a959887…

MALICIOUS

PDF

73.3 KB Created: 2021-04-06 12:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e8f9522a750236037436547df7644fe SHA-1: cfe664019e26f93b2c508006ca281899438fba11 SHA-256: 4771b2600a95988744f43a1fc341e0395a2ada99fcc0380091a96eefdc44e78a
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which point to suspicious domains and are part of a link farm, indicating a redirection or SEO abuse tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=practice+workbook+answers+realidades+2
    • https://cdn.sqhk.co/milagaleja/FjjihMc/video_lagu_alif_ba_ta_sa.pdf
    • https://cdn.sqhk.co/bofotabi/yidggnI/foneganiwa.pdf
    • https://cdn.sqhk.co/kagelemovo/hg6UgeA/dreamer_lyrics_martin_garrix.pdf
    • https://cdn.sqhk.co/kafexobesa/Lgfrhjp/one_stop_shop_financial_services.pdf
    • http://naxiziwakeguzor.iblogger.org/77595641194.pdf
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.pdf
    • https://cdn.sqhk.co/pegipoveridi/ifieflB/clash_royale_chest_simulator_app.pdf
    • https://cdn.sqhk.co/wubunepan/7upPjd9/residual_plot_excel.pdf
    • https://cdn.sqhk.co/moxibusas/itiaQhd/fuvawono.pdf
    • http://sikakapu.medianewsonline.com/english_grammar_quiz_with_answers.pdf
    • http://nageramuvepom.mywebcommunity.org/sloan_flushmate_m-101-526-f3_keeps_running.pdf
    • https://cdn.sqhk.co/xobevopu/ggQryNs/fefok.pdf
    • https://cdn.sqhk.co/rujiwujik/fYijyjh/animal_supply_house_locations.pdf
    • http://zitugaxusi.mygamesonline.org/physics_textbook_class_10_ssc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_fd64478fa735401cae4a912574feaa3b.pdf?index=true
    • http://dokubuxopid.rf.gd/afro_house_sample_packs_free.pdf
    • http://punolubumima.epizy.com/college_application_resume_template.pdf
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_9458093f7b4a486dbe7d87d7eb60aa69.pdf?index=true
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_093352eae00a4fad9c8cd1ffcd684b32.pdf?index=true
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_f5778dccc8964cb793c1c82688fddd1f.pdf?index=true
    • http://tebevem.rf.gd/19534233088.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0db.bin
6141d6f42941e4401fc3d305d26709b945561bf670d16ab80e57beaf1e627034		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 5364 bytes
font_01_sfnt_off0000f333.bin
86bc8d520b1b18176c3dd1289b5162cd1362583482be197a4137c67fde5939f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 10784 bytes

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