Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e44fb96fc2b0072…

MALICIOUS

PDF

110.5 KB Created: 2021-03-31 17:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1e5e6e935aa962af75fa9b513ff2754d SHA-1: bbed177b97c414ddf69fdf8c31160d05472b4ce8 SHA-256: 8e44fb96fc2b007296b6b9aa54a7debe7199744b3862b69d65dbb7b78261d3f4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/123?utm_term=children%2527+s+rights+and+responsibilities+worksheets+pdf PDF link annotation
    • https://voxalasodakuro.weebly.com/uploads/1/3/4/0/134042561/badisel.pdfIn PDF document text
    • http://sungo1.space/business_flyer_templates_free_wordhus7u.pdfIn PDF document text
    • https://kebolegenadudus.weebly.com/uploads/1/3/1/4/131454121/gibita-zumuzasobusef.pdfIn PDF document text
    • http://sputnews.com/how_to_use_ultra_eliminex_detox_drinkg19ws.pdfIn PDF document text
    • http://firstflirts.site/how_much_is_it_to_rent_a_car_for_a_week_at_enterprisepjote.pdfIn PDF document text
    • http://saudiautoinsurance.com/how_do_i_connect_my_bluetooth_adapter_to_my_samsung_smart_tvnwu90.pdfIn PDF document text
    • http://creditstar-kabinet.com/99639649373amw28.pdfIn PDF document text
    • http://fionainthefield.org/mobagigzzhjp.pdfIn PDF document text
    • https://dunudafulu.weebly.com/uploads/1/3/1/0/131071166/546107.pdfIn PDF document text
    • http://otomail.business/priscilla_shirer_armor_of_god_week_1_answerslenl5.pdfIn PDF document text
    • http://trokot-shtorki.online/zoporujisoxiwopiweln3pp.pdfIn PDF document text
    • https://rogopinekesake.weebly.com/uploads/1/3/4/3/134378395/fudim.pdfIn PDF document text
    • http://mumezofenina.22web.org/rc_model_aircraft_design_free_download.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://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_8e4647bec559478793c0ff3e671c8790.pdf?index=trueIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_62bcc5cc3e434a648c266a698c052a75.pdf?index=trueIn PDF document text
    • https://b7c6a474-53ed-4139-af63-4b2f501ae0e7.filesusr.com/ugd/e87294_3cd71362887841bf9c9086f929b2beab.pdf?index=trueIn PDF document text
    • http://ferodokibaw.epizy.com/10464851681.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/32914633194.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/how_to_bypass_administrator_block.pdfIn PDF document text
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_71f8339884314b9189c31d1b6f9eb97c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/ariens_st824_snowblower_parts.pdfIn PDF document text
    • http://ninukak.epizy.com/english_course_online_free.pdfIn PDF document text
    • http://sazovenofejeji.rf.gd/acidosis_metablica_tratamiento.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_off00016704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16704 5444 bytes
SHA-256: af0c1f7787e9faf67b91341f7ba510e1e434c3f7cd4bf95d3c53a0068c9645ef
font_01_sfnt_off0001798c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1798C 10776 bytes
SHA-256: 8aec0446383b614ae944066e12eba264fa7ca59dfba453f75e1cf3eecc50fc5a
font_02_sfnt_off00019df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DF5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2