Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a73c4f4b2be14c…

MALICIOUS

PDF

88.4 KB Created: 2021-03-06 22:50:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 37165a759a1d8844eb807a6632b58d3f SHA-1: 95098defacaea80a32278e0a181937321396e465 SHA-256: 11a73c4f4b2be14ceb26c7e58e43c7f53827d200de7d32f5bd03b0c83b6c1072
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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 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.
  • 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/strik?utm_term=what+is+the+importance+of+surah+mulk PDF link annotation
    • https://xemalijojododud.weebly.com/uploads/1/3/0/9/130969235/dirisetumolog.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/experience_and_education_john_dewey_ebook.pdfIn PDF document text
    • http://theraisins.pro/lg_g_pad_f_8.0_user_manualpcids.pdfIn PDF document text
    • https://fabirakarag.weebly.com/uploads/1/3/2/7/132710689/xerobura.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/how_to_program_the_quadratic_formula_into_a_ti-84_plus_c_silver_edition.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/lefuto.pdfIn PDF document text
    • https://xiligori.weebly.com/uploads/1/3/1/4/131411896/3431762.pdfIn PDF document text
    • http://btsworld.org/best_crucible_act_1_summary4vdjc.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/8048545.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sugizujesel.epizy.com/76304481834.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/31983852949.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/30137645562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2ae0ef-8d94-4c8b-b6e2-ad0ed4e834af/what_does_it_mean_when_it_says_application_under_review.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/55790133666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a44cc277-8d4c-42a8-80ff-a6f4f6739b00/what_is_a_good_professional_summary_for_customer_service.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/antenatal_care_guidelines_acog.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/ccna_3_chapter_5_exam_answers.pdfIn PDF document text
    • http://rolaxaja.rf.gd/mofapad.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/toronto_fun_guide_leisure_swimming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff75e35-6468-4701-b535-87d79e7e7425/epson_workforce_2630_driver.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
    • 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_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 5332 bytes
SHA-256: 13fc44528d7087df051feb39de72c0db436720dd42195c4baf569bc36f7aeb80
font_01_sfnt_off00011341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 12436 bytes
SHA-256: 08f7c0cd9184306c71a126b825e7a125f4689f80da8da52169fa7cfe84525901
font_02_sfnt_off00013bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDF 16772 bytes
SHA-256: bed578877970ef4b4e3f8842613bda524b4139eeb57aaf0ef204db4da537ea1b

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