Malicious PDF — malware analysis report

Static analysis result for SHA-256 c953d29640dcc8df…

MALICIOUS

PDF

80.4 KB Created: 2021-06-08 20:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a818318715791ad524e0020d71b6d51a SHA-1: 59204c67fe02b668a4e5d07380e341ab7ff1cccf SHA-256: c953d29640dcc8dfbfcc192f7f642f8cd1337663d432cc9714ba84a890d67ecc
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://vilenefex.ru/123?utm_term=background+photo+editing+hd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404515/normal_60144a60d637f.pdfIn PDF document text
    • https://duwesokele.weebly.com/uploads/1/3/1/6/131606866/7338284.pdfIn PDF document text
    • https://virubavu.weebly.com/uploads/1/3/4/7/134755547/a6179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_601a5a6882dac.pdfIn PDF document text
    • https://xigarivopupu.weebly.com/uploads/1/3/5/3/135300822/4532421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_605b924ce07ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mefijunov.pbworks.com/f/53181496414.pdfIn PDF document text
    • http://bokibagaror.pbworks.com/f/94181585599.pdfIn PDF document text
    • http://zivovot.pbworks.com/f/jumbled_sentences_exercises_for_class_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7104a4-fd34-49d1-aa69-5491489fe1f1/baptism_of_fire_witcher_book.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/w/file/fetch/144528672/7246515180.pdfIn PDF document text
    • http://mituxap.pbworks.com/f/tililisis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/262b59ae-3408-4877-8b87-02a25abe9217/rt-ac68p_vs_rt-ac68u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e2c443-50e5-4855-af24-d9d6f77df1aa/brother_sewing_machine_model_ce8080prw.pdfIn PDF document text
    • http://lulatigono.pbworks.com/w/file/fetch/144549420/super_mario_all_stars__super_mario_world_rom_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b92d2e59-c7c2-4980-8e9d-e7c5fe263302/how_to_put_beats_solo_2_in_pairing_mode.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144564588/sims_4_pets_activation_key_free.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_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 5240 bytes
SHA-256: 978ce79bc0c9fac213aee990b7f4524c6a2ab21da882758c4d49f6c61b3fb697
font_01_sfnt_off00010e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 11460 bytes
SHA-256: ac0e0be6510e55aada2957bac689fcd7c382d0e1443e75db94decc7c8a14f617

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