Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d43f909e6bafcb3…

MALICIOUS

PDF

80.3 KB Created: 2021-04-22 17:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bcbd26f9bf67b9db4198b75a60cfd618 SHA-1: 714d78790356b2b4d85195bec3b60964a5761f7c SHA-256: 8d43f909e6bafcb3c5b5d98b208655e75ec50550ae73c95947492f9164a9bc26
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 0.9950

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://jacksth.ru/strik?utm_term=pioneer+vsx-1020-k+service+manual PDF link annotation
    • https://cdn.sqhk.co/pobopuwubox/VZicA9y/pixel_bear_adventure_unblocked.pdfIn PDF document text
    • http://trickyturkey.com/xubilunusexidulakerexie7arq.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/Tsqjda5/plants_vs_zombies_super_brainz_toy.pdfIn PDF document text
    • http://sfhgfje5df.xyz/46991201873pmhju.pdfIn PDF document text
    • http://wirelessinfo.ru/nonevateselomezgqkdk.pdfIn PDF document text
    • https://cdn.sqhk.co/kiwapipu/AkhjhjL/pogawulox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_60463d7c547d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_60053bf289a03.pdfIn PDF document text
    • http://voyazh-shina.com/how_to_insert_sigma_in_word_macxn4ix.pdfIn PDF document text
    • http://idealsit.fun/quantitative_methods_for_business_12th_edition_ebookho8gj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_60092b9fa59b3.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/jehbWjf/goosechase_app_ideas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_6035aa267d0eb.pdfIn PDF document text
    • http://nadipasigisapup.22web.org/que_es_destilacion_por_arrastre_de_vapor_en_quimica.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/jAjckmr/romuxojilokimekaxegigine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pofumitiko.epizy.com/visa_invitation_letter_uk_template.pdfIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_ea95b3817b98487ba7e0344c173db8c9.pdf?index=trueIn PDF document text
    • https://0c43c058-97b3-435a-b041-a9f001bfa883.filesusr.com/ugd/791d74_3e80a0b3bead4f3aad8c40dd6643b3c3.pdf?index=trueIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_a68d4451c7854d25b54ff0895660719d.pdf?index=trueIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_c8620020ee404823b42436f5c0806f52.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_2e51802b978e4bdbbdbb843dca6d32df.pdf?index=trueIn PDF document text
    • http://bozejezetides.epizy.com/abbyy_transformer_3._0_crack.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_9ab44167682a49039b1805bb3a11e20d.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_a706f5720b8b40949cb526ac33babf35.pdf?index=trueIn PDF document text
    • https://0c6b2c5e-c852-454c-8c01-bea24f6181fd.filesusr.com/ugd/b97644_59d92a34684e429b9afeab24bb0ba647.pdf?index=trueIn PDF document text
    • http://dekifovep.epizy.com/celestine_donkor_all_songs.pdfIn PDF document text
    • http://potelodifudoduj.epizy.com/bujipevojuvowusob.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_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 5388 bytes
SHA-256: 7e4c3b3c670da1b9efb86f12a3d66819ed9560433faee3e2d2005c04667afb46
font_01_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 5496 bytes
SHA-256: 21878595f8809097ba3bf8bb97cfc4b21ab6b8d36b69a7b7c5e733de7a681ee6
font_02_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 12276 bytes
SHA-256: 1797438db19ea3b42a8125f33d6bb814320b37ea96bd731b002fa01fdfb15b9e