Malicious PDF — malware analysis report

Static analysis result for SHA-256 de88dedbd971d9a8…

MALICIOUS

PDF

77.5 KB Created: 2021-03-24 23:28:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6fd778a35e95c4fbcdc4be6df70318a9 SHA-1: 2843290759aea854898c365c1600043fb27e518b SHA-256: de88dedbd971d9a8e518b9d54be85304e6f9a1c487b39e68d6d12e4fbd79b408
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 0.9997

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://zajinet.ru/123?utm_term=hernia+femoral+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470409/normal_5feeae4f01ec0.pdfIn PDF document text
    • http://sodaapp.pro/73969331326keask.pdfIn PDF document text
    • http://nozekem.iblogger.org/kiwasumobetepupus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450048/normal_602cdadc7b3ec.pdfIn PDF document text
    • http://fsbsiod.com/how_to_be_a_freelance_resume_writer3syf1.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/uggoygi/xadesirewebewopivo.pdfIn PDF document text
    • http://jerijoba.iblogger.org/surifaxozibemekejoxij.pdfIn PDF document text
    • http://monufovaxuj.66ghz.com/computer_hardware_categories_examples.pdfIn PDF document text
    • http://rafale.store/demet_akaln_koltuk_mp3_indirm2ijy.pdfIn PDF document text
    • https://cdn.sqhk.co/lajojeletab/iflghip/adidas_slides_mens_size_12.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/enOjicZ/gamestop_corp_investors.pdfIn PDF document text
    • http://magnifioco.site/que_es_trabajo_social_segun_autoresh1bo9.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/732dbd93-4d57-4f63-b3a3-468da01d61c4/explain_how_to_name_binary_ionic_compounds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c4e5f8c-2315-476c-b4c9-07c70ea5feb3/how_to_switch_off_demo_mode_in_sony_bravia_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f7e83c9-159e-4576-a589-fb9561064844/sobujop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eff6f6a-75ba-4865-8095-983cbca9fda7/who_is_considered_to_be_the_father_of_the_progressive_education_movement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb26a892-cae7-425f-8733-9ac8d2cf53ce/how_to_wear_nwu_type_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c9c5c1-eff8-4063-8996-d826acd53c11/singer_athena_2000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8fb26e-1ffa-4b93-81b6-e98042fc11f3/towumuwariduwox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/088c27f4-abae-4ee3-b649-a3849862826b/sherlock_holmes_books_for_kids.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_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 4968 bytes
SHA-256: e78d7642f53ce2fa18ec5c96d60febf18e816ef4e4f8354c73686dcce1b33582
font_01_sfnt_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 10548 bytes
SHA-256: 3cd27bd3858f1dbb1e0df0cb1cb585dde37055e61fadfd71d23f0a0f4ec6f9fd

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