Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0951c56e21a0d44…

MALICIOUS

PDF

97.3 KB Created: 2021-04-05 01:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 99ca0a67e85f86d6c259ee6e7133fe06 SHA-1: 7510c944724c6c8e6e0ee6905d45b612646700b4 SHA-256: e0951c56e21a0d44703fd9a89615f570476aaa1ce3ad4518d458560c1f643f3f
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and an ML classifier also flagged the file as malicious. The presence of embedded URLs and the nature of the heuristics suggest the document is intended to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://druttle.ru/award?keyword=maslow+hierarchy+of+needs+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480893/normal_5fcbac163263f.pdfIn PDF document text
    • https://cdn.sqhk.co/kepolapawef/eFieibI/lubibesuxurufowekas.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/1749559024.pdfIn PDF document text
    • https://vukegodepobaxi.weebly.com/uploads/1/3/4/6/134676750/konajitipulujof_jagekapujoka_teboda_jupifipewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447447/normal_6051f4651cb4a.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/tobukufag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_5fda8b136d6f0.pdfIn PDF document text
    • https://fenorepaxok.weebly.com/uploads/1/3/1/8/131856491/xigekas-duzuzenup-simajap-fotuvax.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/AihuKpS/when_the_vikings_score_i_think_yes.pdfIn PDF document text
    • https://gigufeti.weebly.com/uploads/1/3/4/6/134633464/kajabasab-riluka-joxokogopaduwol-xipodalipisuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/mewowoji/Gihyic5/download_game_hungry_shark_heroes.pdfIn PDF document text
    • https://gabubogoko.weebly.com/uploads/1/3/3/9/133997439/6013782.pdfIn PDF document text
    • https://cdn.sqhk.co/sibonawumup/hhciihj/admin_dashboard_php_template_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_6041c7f087339.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5feb0bf0c08b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419437/normal_5ff6734d67fef.pdfIn PDF document text
    • https://zopiwaseka.weebly.com/uploads/1/3/0/9/130969839/xiregezi.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/calligraphy_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/hesjdih/sculptor_credit_opportunities_master_fund_ltd.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/fasudikek/worksheet_on_possessive_nouns_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/36306457597.pdfIn PDF document text
    • http://segurixuzek.myartsonline.com/77089939360.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/50659447191.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/selarugofojifafatep.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/best_devotions_for_dating_couples.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_off00013c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8C 5644 bytes
SHA-256: 4848a9d6b56e5010cc53aac52e44d62d2d1e51a1cf7a5e382a41610121dafdee
font_01_sfnt_off00014fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD8 11028 bytes
SHA-256: feadf9a7634db95af7226da802fb80985dff86edb2c801c1d11ef47ee4a924f8

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