Malicious PDF — malware analysis report

Static analysis result for SHA-256 288ab8bc20d8990d…

MALICIOUS

PDF

92.0 KB Created: 2021-04-25 00:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8c8373890b475a736606ffa1661c1ee1 SHA-1: 17257f0e9d5395a4bdf90f21ad303e2fd0598c82 SHA-256: 288ab8bc20d8990d6fa713efdf906499e818b5bd2b693d7ba4b58f5128e9ee49
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://nipisod.ru/strik?utm_term=the+magus+book+francis+barrett PDF link annotation
    • https://mulodetudujidof.weebly.com/uploads/1/3/5/3/135325190/45eb6e5eb4.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/MiaJhDw/world_rowing_cup_3_2019_live_stream.pdfIn PDF document text
    • https://cdn.sqhk.co/givinonu/hc5pLhf/vowojufop.pdfIn PDF document text
    • https://cdn.sqhk.co/vigamodijek/j1ehhhh/assassin_s_creed_3_remastered_ps4.pdfIn PDF document text
    • https://devitigofe.weebly.com/uploads/1/3/1/0/131070043/vabopiparipoviged.pdfIn PDF document text
    • https://vegekonewipure.weebly.com/uploads/1/3/5/9/135964828/06e9d675b129f.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/ccf0fd6.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/PNnGKhd/date_a_live_spirit_pledge_global_pre_register.pdfIn PDF document text
    • https://lenololiwi.weebly.com/uploads/1/3/4/4/134455370/xudam-xodomago-muregowunemelan-fotixu.pdfIn PDF document text
    • https://cdn.sqhk.co/gafokoru/3jby7hb/samsung_health_heart_rate_note_10.pdfIn PDF document text
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/waxab.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/jamunogoduwomufatiw.pdfIn PDF document text
    • https://zekupepub.weebly.com/uploads/1/3/5/9/135992873/fa3ed07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_6fb4c27f3b6c4c51bba63d63c7de1137.pdf?index=trueIn PDF document text
    • https://50d6655e-e9af-4df2-b6e2-294c5d99b354.filesusr.com/ugd/1d3654_6f4d2ed78daa49de845d2a843708d252.pdf?index=trueIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_5b232174606849a3bb3280497a8eddf1.pdf?index=trueIn PDF document text
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_7ae0da9d566f4022b15b6597d600eae8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2921c83b-5f30-40f5-ac90-5abc8c6db119/26489107158.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_0c8a89ded7984c2594d5723eca2e4e2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f05dbdec-33d5-49f0-9e47-2ec6a1428215/maplestory_patch_history_basilmarket.pdfIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_73c05c85a0324ab5988bb5e7fb913a32.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_6a5f77fd19094f3ea0c1ebd54e304ef2.pdf?index=trueIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_573fbfe7a8974f6eb68395aebc0e8c31.pdf?index=trueIn 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_off00012771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12771 5416 bytes
SHA-256: 20d97b7ea7cf48c54bb38d7c11039edb7d26f3d820eaae43b60f8b3213555afe
font_01_sfnt_off000139b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B9 12412 bytes
SHA-256: c95cb199f7589fea309bab500c7a9bfbd62d5d2e354f30524d82ae7456d8acab