Malicious PDF — malware analysis report

Static analysis result for SHA-256 d200c6b414ac46e1…

MALICIOUS

PDF

93.7 KB Created: 2021-03-25 17:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0d891acd07e59f42c6665e2870b99c7d SHA-1: 5479332293892e8e514dec6b1c92cbc7fc65d3c4 SHA-256: d200c6b414ac46e19670373371ea40e5c03d717a13a83f6f1db91f4db8aaacca
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to contain metadata related to 'wkhtmltopdf' and a chapter title, which could be a lure to disguise the malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://jumiwimov.ru/strik?utm_term=a+thousand+splendid+suns+chapter+50+quotes PDF link annotation
    • http://tofabukusakuni.22web.org/android_tv_setup_tcl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_5fdac8500c43f.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/ShehdhU/dino_jump_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/gidagolusi/iiJjhvK/d_d_5e_tempest_cleric_character_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/haiauWa/lesiludetinez.pdfIn PDF document text
    • http://sevoxotedeki.medianewsonline.com/official_methods_and_recommended_practices_of_the_aocs.pdfIn PDF document text
    • http://zavulibalox.mypressonline.com/cairo_subway_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459036/normal_5fe99c385d8c0.pdfIn PDF document text
    • http://gizigevom.mygamesonline.org/berlioz_symphonie_fantastique_2nd_movement.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/MW7geie/85790322880.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/casein_present_in_different_samples_of_milk.pdfIn PDF document text
    • http://pezamax.myartsonline.com/56114491275.pdfIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_8680e60c018046ef837af44281862dd8.pdf?index=trueIn PDF document text
    • http://zimaroted.rf.gd/resistencia_bacteriana_a_los_antibioticos_en_mexico.pdfIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_a514106b2dc446d48c7afbd30767bca9.pdf?index=trueIn PDF document text
    • http://mifijikamipupu.epizy.com/niborapinopadurozere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c37bf6e-e14f-4c55-be15-438848316084/leferazazodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02eff404-a655-4f5b-9efd-ae8f49036cd4/kizadanoxopezaxid.pdfIn PDF document text
    • http://libunemep.epizy.com/jawapofefoneti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf9eee4-6735-4b5e-80f4-531c24787c97/39059363089.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_9c7d6468eeb64960b4d5a9b60293dc88.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e38bec-188e-4310-ad2f-238ff4fdcaf6/lg_pad_7.0_hard_reset.pdfIn PDF document text
    • http://zugejono.epizy.com/year_3_maths_national_curriculum_worksheets.pdfIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_25a5a56842ab43ee927db63632111e85.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 5540 bytes
SHA-256: 4d02879aa07d264e0ceb2c1da3ddf83c41c1695092a2a4da3848b7a28da30b6d
font_01_sfnt_off00012f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F00 10660 bytes
SHA-256: 273004005f256fe068082e8d9bc886a30cee5a1de6996decd8cfbbd53c894d50
font_02_sfnt_off00015390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15390 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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