Malicious PDF — malware analysis report

Static analysis result for SHA-256 784f5aa4ebec759a…

MALICIOUS

PDF

86.1 KB Created: 2021-03-25 01:24:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dcfc761273ff17f3c1163688c0dd065e SHA-1: 9e4644c66a449c312de1abd344e7e055ca59aed3 SHA-256: 784f5aa4ebec759a2bf3c37f9758652197f9f3ef3d9488c28dffe266acefc363
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://nipisod.ru/wix?keyword=uses+of+mineral+worksheet+answers+gizmo PDF link annotation
    • http://granitmetrospecstroy.ru/the_hunger_games_2_movie_download_in_hindi_filmyzillazufhx.pdfIn PDF document text
    • http://forpost-electrica.ru/bivusonovr6l0x.pdfIn PDF document text
    • http://www19216801.site/52587967451tb074.pdfIn PDF document text
    • http://oyuncuxx.com/diary_of_oxygen_thiefjkavb.pdfIn PDF document text
    • http://alisabor.design/how_do_you_troubleshoot_a_hydrostatic_transmission99p06.pdfIn PDF document text
    • http://zifirarukax.22web.org/aprendizaje_basado_en_problemas_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/aiaghic/72181520259.pdfIn PDF document text
    • http://de-bewertung-889562.icu/zizodegio0ffe.pdfIn PDF document text
    • https://cdn.sqhk.co/toxotunem/571gehg/directv_customer_service_phone_number_24_7.pdfIn PDF document text
    • http://kulokozataxat.22web.org/adjectif_verbal_et_participe_prsent_exercices.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/f79e165f-fd4a-4984-8e87-a4d465789844/logitech_z506_5.1_pc_speakers_manual.pdfIn PDF document text
    • http://getetir.epizy.com/classification_of_drugs_in_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c5d985-b6b6-47e0-b8fe-8a5b8d612a06/10956428338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a604627-d487-49a7-ad04-e0d74e7bf771/lakisije.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/14753352877.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/arbor_acres_broiler_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64802609-5de6-4771-adad-86bb9df46a8f/linux_shell_scripting_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/burger_king_jalapeno_chicken_fries_carbs.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/what_is_the_difference_between_mary_and_martha.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/bigekefoxozipanilamorusak.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 5164 bytes
SHA-256: cab6582187e6f9ebfc387741493b610a64537a8fcd756b5ab7cc8c7e77f04997
font_01_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 11036 bytes
SHA-256: 4fdf2bad25e6f7252e85e8723d62e4a888821ad5e90e7c3039b69cf99f25c06a
font_02_sfnt_off000127df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DF 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330
font_03_sfnt_off00013c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C77 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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