Malicious PDF — malware analysis report

Static analysis result for SHA-256 869ca51e4be0ed51…

MALICIOUS

PDF

74.2 KB Created: 2021-03-28 22:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a7308c013c468fefc28924436c0c319f SHA-1: 342542154057c1bafdd00e90a1ab3ed0cf7296ad SHA-256: 869ca51e4be0ed51ebe9436ad897c703ffdaccfcb667760b44331395406b57ee
164 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. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9740

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://mezovuduw.ru/wix?keyword=nys+master+teacher+program+stipend PDF link annotation
    • http://flowerport.store/map_of_world_hd_wallpapergbmb4.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://milky-rp.space/58690271166ohgbr.pdfIn PDF document text
    • https://fenogelojana.weebly.com/uploads/1/3/4/9/134904444/e3b6879f4fc81.pdfIn PDF document text
    • http://workshop-fb.ru/5286677589b1k2q.pdfIn PDF document text
    • http://bcipreactivaperu.com/dekiviwowenowwqti0.pdfIn PDF document text
    • http://tekplafond.xyz/92492906289f4lzt.pdfIn PDF document text
    • http://allerlo.xyz/pathfinder_skulls_and_shackles_campaign_traitss24qw.pdfIn PDF document text
    • http://profyhouse.ru/79749052189p8iao.pdfIn PDF document text
    • https://xirojanolaxoz.weebly.com/uploads/1/3/4/7/134723589/1115639.pdfIn PDF document text
    • http://pornbustyvids.com/99715792126e0jt3.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/jedadokuti/kojajetogujotivekenix.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/blackberry_z30_android_file.pdfIn PDF document text
    • http://pagumasobud.rf.gd/bach_flower_remedies.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/muxesisunumikilake.pdfIn PDF document text
    • http://gidepajujida.rf.gd/pexunozedenitukonegofi.pdfIn PDF document text
    • http://gijezek.epizy.com/34169870240.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/how_to_cite_online_journal_article_apa_style.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/how_to_bleed_a_kerosene_monitor_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/lonidaluxojatep.pdfIn PDF document text
    • http://lidorozina.rf.gd/bibliographic_control_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/chill_out_music_album_free.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_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 5528 bytes
SHA-256: 491d025da5a6c6c8945bf491849cc4db98c83c1be8835a7bf925d267353e9e74
font_01_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 10636 bytes
SHA-256: 9d169c8b34eb19aba90c5cae201f3135d7f95250c0f65ac9a1a01c0dde588ba9

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