Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05e3a55beefde77…

MALICIOUS

PDF

77.5 KB Created: 2021-02-15 09:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 42d068bb06c819608618d67f0a49eb85 SHA-1: ca1a2644d310d4edd1134217f2f4544234c93749 SHA-256: e05e3a55beefde778bb66372379b1ce8aaffb80477e4da83fa9b78b700bbf065
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to external resources via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/aws?utm_term=advertising+and+sales+promotion+mba+notes+pdf PDF link annotation
    • http://weareanonymous.org/benzyl_chloroformate_msdsseo0k.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/badubebisusejinuvib.pdfIn PDF document text
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/9241207.pdfIn PDF document text
    • https://kixaxadamakike.weebly.com/uploads/1/3/0/7/130775249/5495bc399dd2fee.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/jjkWEhd/6610725308.pdfIn PDF document text
    • http://fakts.design/child_care_redetermination_form_mn4ftca.pdfIn PDF document text
    • https://kokubuzo.weebly.com/uploads/1/3/4/0/134017800/kaboviref.pdfIn PDF document text
    • http://daliadiago.com/sezajebufufenuw9lqmg.pdfIn PDF document text
    • http://sunny-web.ru/kindred_download9pni0.pdfIn PDF document text
    • http://wide-mean.top/tenusesopedaghvb3.pdfIn PDF document text
    • http://samyog.ru/stanley_myers_cavatina_pianozmpkd.pdfIn PDF document text
    • http://netewe9.xyz/the_center_of_oceanography_and_marine_biology_moskvariumqap7k.pdfIn PDF document text
    • http://idealsit.fun/16352656460rrxps.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/ghaniit/rodupituvidekugedufe.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/xisefowu/babul_ki_dua_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/kingdom_come_deliverance_bow_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/lozos.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/acknowledgment_of_paternity_aop_form_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/49193357065.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_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 5548 bytes
SHA-256: 8d7fe253cea0937e04e3485421376d1d909080067f237483afad64cd8dc2e798
font_01_sfnt_off0001043a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 10704 bytes
SHA-256: 1f8a540ae1775a57f16e99e30a0fd4e05065b7535d4c916d41fa80991324eb13

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