Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba90b827bec9bcab…

MALICIOUS

PDF

75.9 KB Created: 2021-03-14 02:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a4a71d5ed532a5b101dd377e656b60d3 SHA-1: 9c9d9ba31d6f092097c232dcb9411b171eaf4f52 SHA-256: ba90b827bec9bcab6f10071840d3daa5a9f3307fdcb8045ed11a88db30d78246
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 0.9998

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://fokemale.ru/strik?utm_term=hidden+objects+printable+for+adults PDF link annotation
    • https://kadexatazi.weebly.com/uploads/1/3/4/6/134648676/b19af7886cdaf.pdfIn PDF document text
    • https://wilasumoleliwu.weebly.com/uploads/1/3/1/4/131414134/zerupuwuvirazu.pdfIn PDF document text
    • https://lelibajoterudu.weebly.com/uploads/1/3/4/0/134042739/9488888.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/7296282.pdfIn PDF document text
    • http://pagebake.com/concepts_of_programming_languages_11ecb9d.pdfIn PDF document text
    • https://cdn.sqhk.co/rodesedaded/x5ggMAr/wexakafidabomolez.pdfIn PDF document text
    • http://fojedera.22web.org/how_to_lose_belly_fat_smoothies.pdfIn PDF document text
    • http://reduslim-eu.site/kohler_l654_engine_service_manual59icn.pdfIn PDF document text
    • https://cdn.sqhk.co/vodadavubex/eHtKhg0/free_car_performance_mods.pdfIn PDF document text
    • http://sexedate69.site/straw_man_definition_financialrqvgu.pdfIn PDF document text
    • http://fasadi.site/garmin_gps_48_12_channel_pricegy959.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/cqT9ZaM/47893165426.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d41050d-f7f7-461b-a46f-23888dc976ca/dell_powerconnect_2724_default_ip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e78691db-fb59-4940-9df8-6fb8343ab699/noruviwunilulejelu.pdfIn PDF document text
    • http://fijukarevi.epizy.com/52462295380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec393f94-197b-4eae-ab19-6b92b1597099/csu_elm_practice_test.pdfIn PDF document text
    • http://sevikatep.epizy.com/8086_instruction_set_and_assembler_directives.pdfIn PDF document text
    • http://sumoguvovubipil.epizy.com/funeral_booklet_template_catholic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9b5f52-4680-4128-be62-ce31f62f92f9/21764709612.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_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 5328 bytes
SHA-256: f66038bb7ef2e0114f76775292e19cb976e6d9d78eb75b6c77cc0f2297270665
font_01_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 10576 bytes
SHA-256: 99989d98215377c194304b3cdee5f1d9d569678a7a1bcf1fccaaaf319599e71d

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