Malicious PDF — malware analysis report

Static analysis result for SHA-256 5738b63d8234f9e7…

MALICIOUS

PDF

81.3 KB Created: 2021-03-23 21:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 52c8395689d421631fb864ad45c990a4 SHA-1: 9999ab3d6628761852045807340a58670ab9487e SHA-256: 5738b63d8234f9e72951f4c257bb521e0abc6444f5a09c00b87f9fa21d42b2bb
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 0.9998

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://baarspo.ru/123?utm_term=chromedriver+for+selenium+windows+64+bit PDF link annotation
    • https://poliradu.weebly.com/uploads/1/3/5/9/135991332/4c9b15e9.pdfIn PDF document text
    • https://pulogumofus.weebly.com/uploads/1/3/0/7/130739416/9102430.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/cEnhLyQ/don_t_touch_the_spikes_world_record.pdfIn PDF document text
    • https://cdn.sqhk.co/savujegu/ibjj56h/flip_runner_mod_apk_1._1._10.pdfIn PDF document text
    • https://burogoga.weebly.com/uploads/1/3/2/7/132740280/3696c991.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/characteristics_of_life_worksheet_answers_key.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/ih8jjif/46640718445.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/OKhdic2/x_plane_10_mobile_flight_simulator_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/dediwifime/rvliieS/91374441633.pdfIn PDF document text
    • https://cdn.sqhk.co/jasolugud/hiejbN2/tumevi.pdfIn PDF document text
    • http://suxurifu.22web.org/tozifidexen.pdfIn PDF document text
    • https://surexirubale.weebly.com/uploads/1/3/4/0/134000129/1659a116b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gelutosedufom.epizy.com/coroplast_sheet_cutter.pdfIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/hr_project_report_on_employees_absenteeism.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/64344645944.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/gowukibufazabexorolilomin.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/52052874858.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_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 5376 bytes
SHA-256: a3e64b83083cf3fd1468f32a7e560a459ab747e21903147aca41ae15047155c1
font_01_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 10656 bytes
SHA-256: 3d590d9f726b18dfd6aad9ace7b500997f1329c184a71d0fce52d566d1375642

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