Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b9f92fcfbb35b3…

MALICIOUS

PDF

77.8 KB Created: 2021-03-17 16:36:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: beb8da3457ab1a8ad152c06445b6ee09 SHA-1: 5333db0374f744ed066571219b8733e3f856cf38 SHA-256: 13b9f92fcfbb35b37737626da396792044ca7d8bbed91aa65a3174e0bcd8768d
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://xajibur.ru/strik?utm_term=ged+practice+math+test+with+answers PDF link annotation
    • http://plsale.pro/rolling_sky_2019_apkehkj0.pdfIn PDF document text
    • http://walletelectrum.buzz/triac_bt136_datasheetsi9gd.pdfIn PDF document text
    • http://ketosimple.online/98958428221r5ky1.pdfIn PDF document text
    • http://nesobaka9.xyz/kenmore_series_100_washer_wont_go_past_wash_cyclea35my.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/jgjhgha/strategic_thinking_skills_great_courses.pdfIn PDF document text
    • http://net-klientov.ru/349551983395j85t.pdfIn PDF document text
    • http://onlyforyou.space/data_warehouse_lifecycle_toolkit_freef3uzc.pdfIn PDF document text
    • http://fuckfrsky.com/264165485795sqlh.pdfIn PDF document text
    • http://blockingscenery.com/bissell_spot_clean_professional_carpet_cleaner_ukcf983.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/gP1QjdS/wildlife_coloring_pages_to_print.pdfIn PDF document text
    • http://winoraama.fun/80218971155smeod.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/b7ic6jg/fozudupefagatu.pdfIn PDF document text
    • http://lavka-karamel.ru/wonanefizelomepusejonokee4ixb.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/ggheUMC/youtool_interior_fivem.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/504668488577foyr.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/hfdgfib/espn_ufc_fight_schedule_tonight.pdfIn PDF document text
    • http://lg-copyright.com/vertical_analysis_of_balance_sheet_sample2w0rj.pdfIn PDF document text
    • http://waystep.site/vatilizapuravejofedixemrw4v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_33dc14848e244ac5b9bf46e87895f408.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_eaa9f28cbd034335b7bc775de416c33c.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_373c3bf808ab4e448a6cecd412fb4533.pdf?index=trueIn PDF document text
    • https://c0e8410b-c394-4b36-8083-179878a46647.filesusr.com/ugd/d4b1dc_a54e89f91a0f4886801fc720c62de638.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_b3fb13ecab3e46d0a840687a7cc1af67.pdf?index=trueIn 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_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 5404 bytes
SHA-256: 08c44b1fc21e5a9a642e1ab7244a3b7708ac5d572be2fde1bcb2dcd9963d068d
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 11436 bytes
SHA-256: a45ed76ac53142c6b2fb94bb338518fba6c6fb6a2abb80b4843bb1b32e3f9a71

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