Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0b1872597b5580…

MALICIOUS

PDF

77.1 KB Created: 2021-04-08 07:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 393b93ba0f432c87c0dd4ae25659dabb SHA-1: 9f31330c6840b5c711ff3ac3e3f4a35e69601f4e SHA-256: bf0b1872597b55807b2f1b5e879cd15b17e148ed3291a324611974b5add28182
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://resalured.ru/strik?utm_term=basic+english+grammar+book+1+answer+key+pdf+free+download PDF link annotation
    • http://copyrightsupport-ig.com/52474848776tkd83.pdfIn PDF document text
    • http://grigolia-studio.ru/does_cox_have_newsmaxj64oj.pdfIn PDF document text
    • http://xejevojesinil.22web.org/improvement_plan_template_word.pdfIn PDF document text
    • http://tegor.xyz/sample_science_fair_project_display_boardsdgpx7.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/jegdQAz/physics_puzzles_truck_and_box_line_freezing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_6017637147f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_604fbb841afd8.pdfIn PDF document text
    • http://bifovasux.22web.org/6257651248.pdfIn PDF document text
    • http://nejoxulogawa.22web.org/wazelef.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/idJGgfY/89241860205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388041/normal_600945cf608b1.pdfIn PDF document text
    • http://stat-index-co.com/danajudaj16o4.pdfIn PDF document text
    • https://cdn.sqhk.co/mujutuzidip/ijI07Hv/92763494866.pdfIn PDF document text
    • http://spindlndou.space/vba_excel_tutorialhvgsd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gelotamarabi.epizy.com/4677879369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf3ca08-5696-464e-b7d3-9032ee0c504a/what_episode_does_elena_and_damon_dance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a9ebd0-3839-4111-8066-cc91595a8af2/introduction_to_real_analysis_4th_edition_solutions_manual.pdfIn PDF document text
    • http://purarugamepamak.epizy.com/xufom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e92c360e-6f47-4cb1-9483-dc6e5edbdccd/lutudunezanuxomone.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 6068 bytes
SHA-256: 9ccbab81c02a3551938412cedb2b47113529760393470c13631907d6d62fe0c1
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 10860 bytes
SHA-256: 204930947f31c18d6728138139113aab3dabb4d8543a5a0b8809e63d6474b2c5

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