Malicious PDF — malware analysis report

Static analysis result for SHA-256 84daaed388086965…

MALICIOUS

PDF

133.4 KB Created: 2021-03-25 10:48:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ebc20b0994e6a5c228e98883a1148537 SHA-1: 57b9f7cce1b84bd7e2c708183eb25369c0a4cfc9 SHA-256: 84daaed388086965749cec37446a0184770bcc6e9b116a30b569bebb93b7f226
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 0.9986

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://seumenha.ru/123?utm_term=united+airlines+gate+information+at+o%2527+hare PDF link annotation
    • http://teksalon.xyz/298682224699ajwk.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/iZiisgh/wagakejelim.pdfIn PDF document text
    • http://fortuneo.biz/lifalisudosumifumokzfrq.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/kitchenaid_superba_oven_control_panel_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/gGgdBjg/marketing_plan_in_a_business_plan_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/xXQhifn/70521431475.pdfIn PDF document text
    • http://lesantyqas.online/group_theory_in_particle_physics_drivexvda0.pdfIn PDF document text
    • https://cdn.sqhk.co/lagazowasobo/ihgjIld/top_hits_of_the_80s_by_year.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/badminton_court_measurement.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/eagc2ic/9833786953.pdfIn PDF document text
    • http://hr-insider.com/elbow_the_bones_of_you_sheet_musiclrj52.pdfIn PDF document text
    • http://furniture21.online/24002478393utfa9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_327d47a0acef43238681764b8e86fe13.pdf?index=trueIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_371ca4ea7a404764bfec3cdddd32f20b.pdf?index=trueIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_bdec46ba58c7431295c2254f9cafbb87.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_f738642d83eb41ecabd38c05fa13f8cc.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_79c17889769c43f78772f5deadf1fe0f.pdf?index=trueIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_9deb1248e9a4476995866709e763ad0f.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_a172ddaf28cf442ca94bc10717db0042.pdf?index=trueIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_9e783bc345b34905b72e6b55e633c1d3.pdf?index=trueIn PDF document text
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_a11d84c5267d4c4285560bed9cd6eda9.pdf?index=trueIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_71d87f2b55834045acb9db0608859663.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B56C 6748 bytes
SHA-256: c24b743cf5f0947a3286b243f455c293bae6863970ca19aaa16c9863f60ce610
font_01_sfnt_off0001cc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC8F 5348 bytes
SHA-256: af94920f54cc5e69fd119b42227de81864227deac946f3f9d57b930ea943921b
font_02_sfnt_off0001de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE9B 12680 bytes
SHA-256: f69c1d76c612253d11db25b0ccaf0f251a87bba79d84bbebd1abd282629e1537