Malicious PDF — malware analysis report

Static analysis result for SHA-256 b677715c6f852ed9…

MALICIOUS

PDF

90.7 KB Created: 2021-03-03 19:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 96637f77a8e7cac1e9f156acb78e77bd SHA-1: 5833d16f3fcd2eb70c76b421e259ac8f9ba96bf1 SHA-256: b677715c6f852ed9f823ad6e6d805f9474acf2613180a57bb13fb9a8a02a3ba4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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/wix?keyword=newcomer+et+al+1999+strengths+and+weaknesses PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469105/normal_5fe7abf40e2a9.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/material_de_lectura_para_tercer_grado_de_primariax2nko.pdfIn PDF document text
    • http://tramlaweq.online/communication_and_interpersonal_skills_cv_exampleslbtig.pdfIn PDF document text
    • http://uspex22.online/pomegetefafidev1hd6i.pdfIn PDF document text
    • http://ketorebagibof.22web.org/mopufeziwogogixaf.pdfIn PDF document text
    • http://wilitubejibo.iblogger.org/atoms_history.pdfIn PDF document text
    • http://bachanalytics.com/mukebatejimixesijiwupijexdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503791/normal_5fe5fa1f4f919.pdfIn PDF document text
    • http://auth02mobility.com/lewadibtbx7.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/4397842317391dfl.pdfIn PDF document text
    • http://all-host.site/when_do_you_plant_tomatoes_in_central_floridahpx0n.pdfIn PDF document text
    • http://espaceabone.com/474888293689jesm.pdfIn PDF document text
    • http://medicinfo.online/dark_alliance_release_date_2021n25c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejimafalun.onlinewebshop.net/how_do_you_charge_a_ego_t_vape_pen.pdfIn PDF document text
    • http://pudolajuji.atwebpages.com/financial_accounting_equation_cheat_sheet.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/what_is_economic_freedom_fighters.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_off000126af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AF 5684 bytes
SHA-256: 1c1a617fe1f22b0c7985f077c0db546e35e09e86cf306bb3e810011381f642f0
font_01_sfnt_off000139f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F2 10424 bytes
SHA-256: c75b85b5668ab9f5b9425e279e5bdfe60c10868ea73025296012811cbf025144