Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28f10538b8577bb…

MALICIOUS

PDF

76.7 KB Created: 2021-03-08 22:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8795990318720ca0fe8ba7d0b29a071a SHA-1: 93292d0c477408b4dfe2bbb39106dfef0eb669f1 SHA-256: b28f10538b8577bbea5b53c0c9f14b71ae019a3c01cec843b026fce66548fbd2
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 0.9993

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://botokaw.ru/aws?utm_term=how+often+should+my+bmw+be+serviced PDF link annotation
    • http://kifavofo.22web.org/executive_summary_report_for_internship.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/Hlqunjb/bullet_shoot_3d_model.pdfIn PDF document text
    • http://techanomic.com/jajegalixozupupag1yfkf.pdfIn PDF document text
    • http://cmbmarketing.agency/39225863982bau7j.pdfIn PDF document text
    • http://rezotu.xyz/jusopabirafigeru44rlo.pdfIn PDF document text
    • http://fafazegadaxe.22web.org/10954826299.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/jgd49hd/5_day_weather_forecast_apex_nc.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/ingersoll_rand_2475n7.5-vtslp9zu.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/57508304863691at.pdfIn PDF document text
    • https://cdn.sqhk.co/litanamamusi/ie63jjY/clash_of_clans_best_attack_strategy_th10.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/dHOjijb/32_east_front_street_trenton_nj.pdfIn PDF document text
    • https://cdn.sqhk.co/pewowutefiw/xOsgfYu/42347434135.pdfIn PDF document text
    • https://cdn.sqhk.co/rudixika/kidjhj2/rolling_sky_mod_apk_2020.pdfIn PDF document text
    • http://vimosenap.iblogger.org/gewuzifepufuxuji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dulibunaxojomo.rf.gd/video_orkes_om_adella_terbaru.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/gajazixu.pdfIn PDF document text
    • http://gimokoso.epizy.com/43297203746.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/what_is_the_magna_carta_why_is_it_important_to_our_constitution.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_188cfc40668b4e1cb57841ff7f0051a1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bugutaj/mad_at_school_part_2.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_2a0a48a1839845ef94af291fff807050.pdf?index=trueIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_fbc566e76ee34206b179755a963863a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/21372845603.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_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 5408 bytes
SHA-256: a7589b295ceb87c509b7b80f2feb5886ca1d4195dfcc773fb9eb45089a3ef4b4
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 10544 bytes
SHA-256: c697eb4e9fb5923241e40e8a6ba4dcde4667728ec6f01acdd413faeb1ef26419

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