Malicious PDF — malware analysis report

Static analysis result for SHA-256 26233ff43497bc8c…

MALICIOUS

PDF

86.0 KB Created: 2021-05-08 18:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 17f4bd02763fe6f625ec99a3b52aee1a SHA-1: 109ae7d9cd68a523f8064091ea5f8a538105ac22 SHA-256: 26233ff43497bc8cafcf3bd0d875bf7c44519a008250e651554dd5916821f9ec
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 0.9995

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://maypoin.ru/strik?utm_term=how+to+make+a+snuggie+out+of+a+blanket PDF link annotation
    • https://cdn.sqhk.co/xogovofofi/0RzmxgT/gelitalum.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/OjhOibh/colors_that_go_well_together_in_home_decorating.pdfIn PDF document text
    • http://uk-delfin.ru/que_es_el_lenguaje_verbal_segun_autoresl79px.pdfIn PDF document text
    • http://drnextact.xyz/vunobibozuzumetidfd93f.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/mPRjajb/first_aid_beauty_coconut_water_cream_reviews.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/remiwenuroruvakotoj.pdfIn PDF document text
    • https://cdn.sqhk.co/fivuwunar/iQx7YU0/stay_alert_stay_alive_victoria.pdfIn PDF document text
    • http://likefetevu.getenjoyment.net/bromwich_integral.pdfIn PDF document text
    • http://copyrighthelpptteam.com/english_standard_version_bible_epubmguk9.pdfIn PDF document text
    • http://dkshlyap.ru/graphing_parabolas_equations_answer_keyjma3l.pdfIn PDF document text
    • http://apsdd54gfv.xyz/vuromlwy82.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/47295567049.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://uploads.strikinglycdn.com/files/1345f58e-ebed-49a0-a785-c13b7525a9ad/machinerys_handbook_guide_30th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fad36beb-43d4-42d8-8d1b-0196342bf714/linux_tutorial_for_beginners_free_download.pdfIn PDF document text
    • http://mojozore.myartsonline.com/shri_asaramayan_path.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_12bf9944e95f45018cd1520668fe7ae0.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_3c55d7dc0b974cacaa0361a8d3cd8156.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/how_to_calibrate_samsung_galaxy_note_4_battery.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_b3518dbe52324c44abb28ae2462492b0.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_fcee8f402c6145b088f7b9395bc3aecb.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_116eeb468ec840059484b0c288b20a20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/basic_multiplication_worksheets_grade_1.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_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 5132 bytes
SHA-256: 0bfda65c2611daf9c4474d1aa8aa2d240c5ccebd982a9c0ff389c2c96fea5894
font_01_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 11500 bytes
SHA-256: 082330ca6540a4b8b06031ce9915abce27e41ac9ad21a047e9c56795b31acea2
font_02_sfnt_off00013c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C40 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3