Malicious PDF — malware analysis report

Static analysis result for SHA-256 66721a1f180262e3…

MALICIOUS

PDF

71.0 KB Created: 2021-02-18 17:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 44cdc0df2bddb050d25411541c6f34aa SHA-1: 112a855a6dbf82f865f7e00037e4e5534cb73553 SHA-256: 66721a1f180262e34b8e87496123ab9fa8dd57f3434b17df80fb3f01d371693c
94 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL 'https://yafferge.ru/123?utm_term=hcf+lcm+worksheets+grade+6' is the primary indicator of this malicious activity. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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=hcf+lcm+worksheets+grade+6 In PDF document text
    • https://cdn.sqhk.co/woteruzid/eS8GTTT/fitbit_charge_3_vs_charge_4_comparison_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/gghd4zd/square_root_symbol_word_mac.pdfIn PDF document text
    • http://jerubapuruzol.iblogger.org/play_scripts_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/ihxhdig/sec_14_gurgaon_map.pdfIn PDF document text
    • http://kiwirixup.22web.org/80687256577.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duwamiwimi.rf.gd/sepafesovasiwomokufu.pdfIn PDF document text
    • http://bamemuwibe.epizy.com/yellow_background_colour.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/carry_on_jatta_film_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/77305619353.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/mezanulopupaboserowimeno.pdfIn PDF document text
    • http://vodupuginotipir.rf.gd/bosch_c7_battery_charger_instruction_manual.pdfIn PDF document text
    • http://mejesikiwabez.epizy.com/25912932222.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/84426858456.pdfIn PDF document text
    • http://jezawirigi.epizy.com/97596029952.pdfIn PDF document text
    • http://nowuzapifara.rf.gd/luwenapunuzaba.pdfIn PDF document text
    • http://loxosufodu.epizy.com/vapenemavazuwupumawogiw.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/67258765706.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_off0000d652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 5704 bytes
SHA-256: b5a04dccc87114bf7f52ca8ae23395849de7d83999122cc2effe35c2ff77048d
font_01_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 11040 bytes
SHA-256: b4155d02962a5aa73eecfd3772ff1d35e7d77dc39dbf1d83aac9356a42a2b9ab

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