Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe51874cf650dca…

MALICIOUS

PDF

76.8 KB Created: 2021-04-22 20:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 245ec01387fc986d2081583ffead209a SHA-1: c9da6d74c36722902f5fe0edad2db57757f08542 SHA-256: 6fe51874cf650dcacf5a66bc0b5fde257b37c98a913f3d88df11a5a842196b56
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'botokaw.ru', suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be a lure for a free download, aligning with common social engineering tactics.

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
  • 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/strik?utm_term=what+is+the+free+version+of+fl+studio PDF link annotation
    • http://keepxufi.space/racing_car_game_3dpfk6k.pdfIn PDF document text
    • http://wildboost.club/guitarmaking_by_william_cumpianolf38u.pdfIn PDF document text
    • http://prostotit.site/focusrite_scarlett_2i2_3rd_gen_settingszf6lk.pdfIn PDF document text
    • http://padlamadla.site/54463646380fjp3b.pdfIn PDF document text
    • http://checkmycredit.info/bosukewamatopiveweporokb8gvh.pdfIn PDF document text
    • http://bafakuvim.sportsontheweb.net/silufugobo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/antique_scroll_powerpoint_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/wunupegunulitadurinapij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35a1ddc-a352-40d7-99cd-ee26168221a7/22160643383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bf3cb87-66da-47f6-9079-4b2d9ee856cc/symptoms_of_a_blind_pimple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d396bc73-3c21-48fc-a26a-f7ca0e6dcea8/rehras_sahib_path_download_in_hindi.pdfIn PDF document text
    • http://nosawakudik.myartsonline.com/concurso_auditor_fiscal_edital.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/zibilijet.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/75101977914.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/la_la_land_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf0a6b3-15d2-4161-8f47-a9ee7083dcd5/business_intelligence_report_template.pdfIn PDF document text
    • http://wuxosalilujaza.atwebpages.com/sodafugusapurajezoti.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/how_do_you_read_the_levenes_test_for_equality_of_variances.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc877fb-ad91-4ee9-9f40-85bd03af61c0/95665796064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9483bf-ce26-48d2-93f1-b3424bd08257/how_long_do_you_smoke_a_turkey_on_the_big_green_egg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 4948 bytes
SHA-256: 61e86ad518bb4b7f1139c8ee364b30bb98cb1fe9d5eb5264aaef7efb051354af
font_01_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 11656 bytes
SHA-256: 7e6a17e6adc5c62fcc8e4792f03d6ba688a8038d0a8b5fadbd147855460dc492
font_02_sfnt_off0001164b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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