Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c78f4b8fa8bb1e…

MALICIOUS

PDF

77.3 KB Created: 2021-05-07 11:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d561aa99eaa017edc0002a3e7cd2579a SHA-1: 084febb109a3b9a1c742ef7de9e0197184c35f5e SHA-256: 78c78f4b8fa8bb1e240e502859bb343dc82190b57fd0557eda4cbce08693a9fe
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on disposable domains. The primary URL, 'https://botokaw.ru/strik?utm_term=i+am+a+child+of+god+sheet+music+pdf', suggests a lure related to sheet music, likely to trick users into clicking through to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=i+am+a+child+of+god+sheet+music+pdf PDF link annotation
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/5e7f27641c14ec.pdfIn PDF document text
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/javusu_funufezidemoka_rafidixejolofom_bijoxulad.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/gihtDkx/idle_robot_build_mod_apk.pdfIn PDF document text
    • http://probkin34.xyz/manualidades_navidad_para_nios_pequeos9vl3e.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/Yhdghja/a_planet_of_mine_unlocked_apk_1._035.pdfIn PDF document text
    • http://copyright-central-media.com/clash_of_crime_mad_city_war_go_android6b9wh.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/iaxrYa3/whatsapp_status_video_download_15_sec_new_mirchi.pdfIn PDF document text
    • http://forsage.pw/which_is_the_largest_economy_in_indiawllkp.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/2544769.pdfIn PDF document text
    • http://instapriz24.site/zagg_ipad_keyboard_replacement_chargerbfj8e.pdfIn PDF document text
    • https://vonazevuza.weebly.com/uploads/1/3/4/6/134603973/timana.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/pijThcb/splash_canyon_tropical_hills_level_25.pdfIn PDF document text
    • http://astrohelp.space/broken_heart_status_video_for_whatsappzwaej.pdfIn PDF document text
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/3103760.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_19650be647ee4424ab89552e93868572.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovugi/best_dictionary_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/how_to_bathe_baby_angelcare.pdfIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_b3be22884a1b44cfb7bb61c185a9be8b.pdf?index=trueIn PDF document text
    • https://6b551870-9d71-4c88-87ac-30bafd697196.filesusr.com/ugd/b27e13_7a10e559214944ada995efb9feefddb2.pdf?index=trueIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_ec8434a1ecd84939b8ac745199838452.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_f938dfcd132a4eb0bfc66d490559976d.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_f97f20117f30476fb4b7053490b2ff13.pdf?index=trueIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_8b97f99a5ea7472c9779276be6c99c8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/axis_capital_holdings_annual_report_2017.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_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 5412 bytes
SHA-256: 9a0827772459d502062a1f23fd9d67d5ba5f3478ff02d72a27c37818b1ad6de1
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 11124 bytes
SHA-256: a1d00a79750d77ae7473bf87badce2b472ff997b84f6a20557a5e4e224c0269d