Malicious PDF — malware analysis report

Static analysis result for SHA-256 df731fab8ee22944…

MALICIOUS

PDF

73.7 KB Created: 2021-02-03 23:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0e68fcbd813cabd3798e60a5579a5f9e SHA-1: ae52fff780ee942cd23f8a69362e5aecf24fc19a SHA-256: df731fab8ee22944e538771dc0f85ad8cfbd59b313376e2913161e57ab443442
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on potentially untrusted domains supports this assessment.

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
  • 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/aws?utm_term=ereadingworksheets+context+clues In PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/wOZ3jfL/descargar_ball_out_3d_hackeado.pdfIn PDF document text
    • https://cdn.sqhk.co/filumabit/dijhhjg/sagiwaxasotudijizigapusis.pdfIn PDF document text
    • http://obzorov.site/foxelizidanumukuvujovapelss517.pdfIn PDF document text
    • http://fashion-deals.xyz/numerical_aptitude_questions_and_answers1xiq2.pdfIn PDF document text
    • http://bionatur.space/shaolin_soccer_download_in_tamilyqm8w.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/VnDgjhf/87403670004.pdfIn PDF document text
    • http://itdomen.fun/lebunuqwue8.pdfIn PDF document text
    • http://6gusevshop.space/92053869403jtdip.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/jFPhsic/bofozag.pdfIn PDF document text
    • https://cdn.sqhk.co/wudarivat/aggifgf/motorola_razr_flip_phone_sim_card.pdfIn PDF document text
    • http://nakrutkavk.site/jibemevunofufojl6.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/IChcQDc/77566616550.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/iE8ijlo/history_channel_schedule_tv_passport.pdfIn PDF document text
    • http://pay-order.info/escalating_density_trainingc53jd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lusunumef.rf.gd/motor_hp_to_amps_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/celiac_disease_diet_sheet.pdfIn PDF document text
    • http://viwuleraxukopiz.epizy.com/world_map_blank_worksheet.pdfIn PDF document text
    • http://vaxutusurinav.epizy.com/4008730612.pdfIn PDF document text
    • http://sezajebufixi.epizy.com/arunachalam_movie_free_in_tamilrockers.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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 5380 bytes
SHA-256: 0f78c3568b8bd4952977e9d94e0dd2a701ece4cbdfe67e911fd0f6fd9fe9ecf5
font_01_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 10188 bytes
SHA-256: 644a5259e1388e0c7902109c76055f236a153f5efe04935ea4d0d745f9e9c374

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