Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca4622cfe5e2d83…

MALICIOUS

PDF

76.1 KB Created: 2021-03-24 14:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: de532f215cec44ce34f5ffa715b90b2a SHA-1: 341bf1a9c1638475cb7153d5e876701db84ab1cd SHA-256: 8ca4622cfe5e2d8365747008f4911c46df0e55f6ae86ade0bee5e8fe4e969b59
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though obfuscated, appears to be a lure related to a book summary, likely to trick users into clicking the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=edward+said+culture+and+imperialism+summary+pdf In PDF document text
    • http://topplafond.xyz/12001504665c57oi.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/qNQljhG/mega_millions_pa_lottery.pdfIn PDF document text
    • http://mastericy-chistoty.ru/zezelulofasepijinaveticbov3.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/chjXsLY/8669110218.pdfIn PDF document text
    • http://seplafond.xyz/whats_a_criminal_lawyers_job_descriptionc613n.pdfIn PDF document text
    • http://kafikiwamavo.22web.org/65343984425.pdfIn PDF document text
    • http://good-production18.site/how_to_use_garmin_delta_xc_dog_training_collar33axl.pdfIn PDF document text
    • http://lefefegibilapo.22web.org/how_to_get_management_skills_in_pes_2020_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/pininipata/iiYe2ij/alto_s_adventure_free_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/zicgcaJ/nulameridoxugozame.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/63jfPge/wibusukedemuzukekot.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/iaAidha/ted_danson_whoopi_goldberg_film.pdfIn PDF document text
    • https://cdn.sqhk.co/zirigajer/0hehjjk/panewevera.pdfIn PDF document text
    • http://vunelipu.iblogger.org/thomas_calculus_9th_edition_solution_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/uhaPgjX/fire_alarm_testing_report_format.pdfIn PDF document text
    • http://saxoxiwu.iblogger.org/intel_dq965gf_motherboard_processor_support.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwisivajefi.rf.gd/dixon_ztr_parts_list.pdfIn PDF document text
    • http://rovuwuruw.epizy.com/define_leadership_styles.pdfIn PDF document text
    • http://jibogifimot.epizy.com/dowojadojufuberodasokido.pdfIn PDF document text
    • http://depubewe.epizy.com/national_action_plan_points.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_off0000eb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB76 5452 bytes
SHA-256: 84301f7ea96eef975a6c0d2d13fda887f9289bbd73ca7e27414d04a8eecf2476
font_01_sfnt_off0000fe0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 10928 bytes
SHA-256: 5b2877c17ce2316884c5e6d315e2ad2831209e905a3ba979f6ac2ee4c2182785

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