Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0df6fae72f34f68…

MALICIOUS

PDF

78.2 KB Created: 2021-03-13 21:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fedb37f0a2e840056d24e727fde63c8f SHA-1: 1a1d59cde90ac5d8aca9aa5ccc362f04d47d5ebe SHA-256: c0df6fae72f34f68dce39980208171715ddbbc160e305fb65b2f1aa106fdf19d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO scam designed to drive traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=nj+state+wrestling+championship+2020 PDF link annotation
    • http://mogimetekojubar.scienceontheweb.net/canopen_protocol_tutorial.pdfIn PDF document text
    • https://barijenevedi.weebly.com/uploads/1/3/1/4/131438420/laminugeb-wisemebukelur.pdfIn PDF document text
    • https://fupotitora.weebly.com/uploads/1/3/4/8/134883452/3255833.pdfIn PDF document text
    • https://cdn.sqhk.co/xikokopek/4eE90hj/nigadonojovabodasiteli.pdfIn PDF document text
    • https://bumokodujexub.weebly.com/uploads/1/3/4/5/134595190/popijutigimi.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/uhfyyeb/k1_speed_drift_night_2020.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/how_to_connect_sony_ht-ct780_to_tv.pdfIn PDF document text
    • https://rofobanajogano.weebly.com/uploads/1/3/1/1/131164113/kiwulitazuwopuz.pdfIn PDF document text
    • https://cdn.sqhk.co/tugirujozi/MgeLhe4/ivar_vikings_character.pdfIn PDF document text
    • https://tenosufude.weebly.com/uploads/1/3/1/4/131455069/latovetesomowojir.pdfIn PDF document text
    • http://majikok.mygamesonline.org/bivod.pdfIn PDF document text
    • https://wovodolu.weebly.com/uploads/1/3/4/8/134861979/nulukevajos.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/nalubogos-zutojad.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/modern_romance_film_download.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/orca_quantum_chemistry_software.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_9c6da0a11ef94fee93f09b7c69176484.pdf?index=trueIn PDF document text
    • http://rususekobijo.myartsonline.com/what_a_beautiful_name_agnus_dei_chords.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_804c0b6fa2d5448db86dc0fb3e54016b.pdf?index=trueIn PDF document text
    • http://dugerem.atwebpages.com/etude_compare_de_la_cellule_animale_et_vgtale.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_5ddeeac43c89480cb9a3e89616789e84.pdf?index=trueIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_9336534817e540789a65b1405fc3ddaa.pdf?index=trueIn 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_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 5756 bytes
SHA-256: b1074d993541c2b325135f5e498fabf8d1cbd734b2a1ee798282e7387af07fda
font_01_sfnt_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 10536 bytes
SHA-256: a533099088e4c9ff948b4ff35561cfbdf401bc4420859d5a4522e7999acfd311