Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1197d3d9d5fe0e…

MALICIOUS

PDF

70.0 KB Created: 2021-04-18 01:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 77bad644eb8211b3688f96dda5c0e1c5 SHA-1: 78af6a18f154abac1c3ab920332e53cf478f8fdc SHA-256: 4f1197d3d9d5fe0e700c6306e5d10c48029fc18b0ffffc961277358a94caafd2
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also indicated a high probability of maliciousness. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9169

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+do+charcoal+bubble+masks+work In PDF document text
    • http://dwatches.site/298647415498ig2k.pdfIn PDF document text
    • http://jushq.pro/vuxikowovewekogerovaw6pv3.pdfIn PDF document text
    • http://yogait.space/rev_heads_rally_mod_apk_rexdls68d0.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/125174327233q7x6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_053c9a13bf21467598cc3777deb7c31d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poresi/36147366389.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/jowebubitanuloxekikap.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/climate_change_report_may_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/lufukub.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_284ec7e4c66f42cda5cde936777204b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/pop_warner_scholar_forms.pdfIn PDF document text
    • https://ecad98c5-3f79-4b5a-9309-7060426a101e.filesusr.com/ugd/66ec94_872ddca33dee45b9bcfc4128ec74ae7f.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_6b84b80785f4473aa5b3e73c0cde0d9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/bizzle_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/randy_dickensheets_auction_hanover_pa_auctionzip.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/seagate_blackarmor_nas_440_420_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/onyx_plus_wireless_controller_for_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/notice_of_disciplinary_hearing_template_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/allcast_premium_apk_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/semopigagutevufet.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/hold_me_tight_sue_johnson_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/56961551306.pdfIn 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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 5084 bytes
SHA-256: 5c22b7378c1fa36f0c016bf3c008632fba290de091f6a4e6ffeceb71128cd1de
font_01_sfnt_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 10512 bytes
SHA-256: f88197e56c9c3cf73c4fd4280013443aea12d2407c2d72b08dc0b412ae508b4a

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