Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e468343962ef38…

MALICIOUS

PDF

76.1 KB Created: 2021-03-17 13:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 860573541f3697dd59be774d5ce227c5 SHA-1: 440f4fcdd5b6d441992ce10e7d7355872f433899 SHA-256: b0e468343962ef381ff8ec9d067d631de347b480149d120484f61305239837d1
186 Risk Score

Malware Insights

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

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 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://kuzutuzo.ru/123?utm_term=powerpoint+templates+free++2016 PDF link annotation
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/43853d6679.pdfIn PDF document text
    • http://ig-copyrightviolation.com/what_is_the_poem_remains_based_ondozax.pdfIn PDF document text
    • https://popewike.weebly.com/uploads/1/3/1/4/131407195/9341012.pdfIn PDF document text
    • http://sovetnik53.ru/45821254395jv3ir.pdfIn PDF document text
    • https://novagonuneji.weebly.com/uploads/1/3/1/4/131483078/8215286.pdfIn PDF document text
    • http://bloomwithdeanna.com/69301020443uald6.pdfIn PDF document text
    • http://santand-es.com/how_to_clean_airbrushdz75r.pdfIn PDF document text
    • http://rawenspant.online/starcraft_1_free_download_blizzardjtfwh.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/655ce37d-40f2-48ea-ab06-0e14d40b50f4/club_car_precedent_maintenance_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f1c82b-ff4a-4976-a13c-2b8e990fbda9/dudiboredazilufeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b5cb77-53a8-462a-9cfd-05f25e6f215b/18702217105.pdfIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_637772d1759a4b9f89b22ae84f6b4693.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f24776-b85f-4a79-9bb2-41c4acc54eb9/how_often_should_you_change_dsg_gearbox_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0506f5e8-e90d-447d-81a6-c483a4e7ff1c/mubofolunuvirijonogigilan.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_b2ca16cae47a47a4ab699043657b6231.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_3e0b55e6e04b40eea31e3bbe385f99fe.pdf?index=trueIn PDF document text
    • https://b56e6f12-3f4b-4b75-bc29-9585eb3fba71.filesusr.com/ugd/73f0dd_4f59b38b28f44e8dbfcb49f0f4a60d4c.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_710644bea07f41b5868eb8d6b90b913c.pdf?index=trueIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_0c58105c735d4266887604246064ae2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/903ec275-3183-455b-aec7-c616be9b3dc1/ever_be_guitar_chords.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_118ffa346163470f8f84487e8e1c5366.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e26e545-cdfc-428a-81c2-d4c46efaa361/89826425045.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_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 5620 bytes
SHA-256: 02898512e5ad72a501c24035e224effca7c3bd30a9bb513c6df95e54783d05d8
font_01_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 10572 bytes
SHA-256: 7ad2f32af0bfe92e5e98f4d6c4980ca3fcbb23c531c43b396cc3c62b5d5cf4be