Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b79fc0c7d8b3913…

MALICIOUS

PDF

113.1 KB Created: 2021-02-24 18:34:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 32bc3a2ed7c0c152749a0ff30869c491 SHA-1: 6466e39e55be5964cf374249ee49dddc8795d122 SHA-256: 8b79fc0c7d8b39133678c01d3fc4166f70f8b64bc45e9c209b551ff84d2f9109
184 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to Dell monitor specifications, suggesting a lure to entice users to click the malicious link. The presence of numerous links hosted on disposable domains further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crophysi.ru/award?keyword=dell+u3415w+specifications In PDF document text
    • http://xasujaru.22web.org/gds_committee_report_latest_news_2018.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/laler.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/ford_mustang_shelby_gt500_price_in_south_africa.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/56443163732.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/5_languages_of_love_gary_chapman_test.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/depuxexizokofalilolusomon.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/how_to_say_phthalo_blue.pdfIn PDF document text
    • http://valupimabo.22web.org/gillanders_arbuthnot_co._ltd_annual_report.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/pdf_el_juego_de_la_vida_y_como_jugarlo.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/dibhb7b/vowiti.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/ZjiTAcw/96386268871.pdfIn PDF document text
    • https://cdn.sqhk.co/zizaratijiga/BhgX9ij/frag_pro_shooter_tier_list_1._6._5.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/djhgjhj/xajatojoligevipiwokuwi.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/renewable_and_efficient_electric_power_systems_solutions_manual.pdfIn PDF document text
    • http://zebizekesodu.iblogger.org/letter_format_for_college_discontinue.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogivumomu.epizy.com/creature_film_songs_free.pdfIn PDF document text
    • http://putazosaw.epizy.com/vixx_lr_beautiful_liar_album.pdfIn PDF document text
    • http://vaguxaza.epizy.com/baghdad_airport_gov_iq_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/pancreas_endocrino.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/85771144525.pdfIn PDF document text
    • http://siwinigap.epizy.com/figokefokupawobi.pdfIn PDF document text
    • http://pibanifadedo.epizy.com/short_reading_comprehension_worksheets_5th_grade.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/44383465922.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_off00017c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C33 5432 bytes
SHA-256: cf997160149e67b7dfdf53e3c007a3189ce8dd52d6aabd0669a427efe3e10132
font_01_sfnt_off00018ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EF2 11332 bytes
SHA-256: 5ead6bc39fd8d4fc8065281c2e9e2d51748d0e5dd376ce9132414712337007a3

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