Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdec7cb1dac63f3e…

MALICIOUS

PDF

75.7 KB Created: 2021-03-04 18:40:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b8dd40b2fc38de68deb84a83e7955112 SHA-1: a68d8464995924216b901fe424ff6ebd76704c9f SHA-256: bdec7cb1dac63f3e2433251aa31b78bcf7c857c02a7636a4dd43fa5f07826d78
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://nipisod.ru/123?utm_term=bose+ae2w+bluetooth+adapter PDF link annotation
    • http://jotupati.22web.org/san_luis_reservoir_fishing_report_august_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413475/normal_5ff819490427d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501975/normal_5fe5526c275d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fd9684a5c90a.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/vedexajawo/web_hosting_free_html_templates.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_0e24ef19bab64c7a984d2c2fa69f1f37.pdf?index=trueIn PDF document text
    • http://tavupovasar.rf.gd/chapter_5_analyzing_informational_text_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/everfi_module_8_test_answers.pdfIn PDF document text
    • http://galiwasik.rf.gd/south_eastern_freeway_traffic_report_melbourne.pdfIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_764ab9d1cc81494bb96ee4acc541a207.pdf?index=trueIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_fda61914f9884d78ade706a4d540994a.pdf?index=trueIn PDF document text
    • http://kisezemewarajox.rf.gd/subordinate_clause_worksheets_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/15425253237.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_2f1642a9dc2847e19ee23848491db062.pdf?index=trueIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_ce4156b1f69341049a4febef83e2da41.pdf?index=trueIn PDF document text
    • http://keviful.epizy.com/at_lp120xusb_preamp.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/loxalagiwalunasoludav.pdfIn PDF document text
    • http://jopipada.epizy.com/bejobumabaxopuvujapirul.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/milestone_template_powerpoint_free.pdfIn PDF document text
    • http://xulodolab.epizy.com/a._s._r_full_form.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_ce72243ff090456997352fec08b48835.pdf?index=trueIn PDF document text
    • http://xazitew.epizy.com/kvm_virtualization_installation_guide.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_74b464415dc644b981424741d98bd3b0.pdf?index=trueIn PDF document text
    • http://jaberorer.epizy.com/nikiseluwu.pdfIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_4e934c73c9ce481ebb80c40232c86594.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_a615cd93ad404e9db127559194c6f017.pdf?index=trueIn PDF document text
    • http://sagapuxoxonigig.epizy.com/administracion_de_medicamentos_pediatria.pdfIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_bc23ec43251d43a0807bb25f9799f6fd.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 5460 bytes
SHA-256: 1bbcce682cc42356a0987b770c1b0c7256e36f32d9a6f9e61c7b559d003c86fe
font_01_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 10052 bytes
SHA-256: 1678d5874c6764c4541eb92265de120e1a0161b07a78a0022ce685c83a0434ad