Malicious PDF — malware analysis report

Static analysis result for SHA-256 341b4dba62752031…

MALICIOUS

PDF

124.0 KB Created: 2021-03-14 18:49:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c01b1d006fd02836fc0c48d33954522a SHA-1: 8010acd4ad2e32adc71a3dd7f2b5ea833365d3d6 SHA-256: 341b4dba62752031e7a76fc2e8a7a33f5dd119ea1bb9272c6bc822ac2315bfa7
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 0.9996

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/strik?utm_term=java+8+stream+map+collect+to+string PDF link annotation
    • http://minomesiguziv.22web.org/diretalapememijupezo.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/jhjcTic/7_day_weight_loss_meal_plan_vegetarian.pdfIn PDF document text
    • http://pagefufobixew.22web.org/wolf_of_wall_street_gif_margot_robbie.pdfIn PDF document text
    • http://nevodoma.iblogger.org/thomas_nelson_nkjv_study_bible.pdfIn PDF document text
    • http://medway24.com/figojugujalowasesidq7ac.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/gggJpie/joridaseronuk.pdfIn PDF document text
    • http://dipitazifageb.iblogger.org/98649908018.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/pvYhdjd/60228183347.pdfIn PDF document text
    • http://beautysss.site/61584315729wfmim.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/Bhjahjp/firasedakamozozazoge.pdfIn PDF document text
    • http://lestyprin.online/48781340918e3eyp.pdfIn PDF document text
    • http://lbaranaydin.com/kbb_rv_guideldaef.pdfIn PDF document text
    • http://butijimixuf.iblogger.org/which_language_is_required_for_android_development.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vosivoru.epizy.com/how_to_design_data_warehouse_and_give_an_example.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/edtpa_task_3_social_studies_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/7466976984.pdfIn PDF document text
    • http://kedenutorufet.rf.gd/xiferexulobazix.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/lanufupituge.pdfIn PDF document text
    • http://litujomotoju.epizy.com/kofusixepipenogi.pdfIn PDF document text
    • http://vojapulipono.epizy.com/68176949688.pdfIn PDF document text
    • http://varudejeb.epizy.com/63448753547.pdfIn PDF document text
    • http://taderadoximez.epizy.com/area_and_perimeter_of_composite_figures_worksheet.pdfIn PDF document text
    • http://resukiluzuw.epizy.com/68515924902.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/50385952619.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_off0001999a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1999A 5496 bytes
SHA-256: f02dba927c61e24d923a6e8c2b3e7cef671f432781ae0e1ffbde5e34a6b95ebe
font_01_sfnt_off0001ac3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC3B 17476 bytes
SHA-256: ec78995a9fdd1e5fc55640ec566d886ed7c1101c3a593a36e5dad6701f583b96

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