Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9e0df396f9f746…

MALICIOUS

PDF

82.1 KB Created: 2021-04-23 16:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c40775990bfe944184fd58cdce0a732a SHA-1: 5582e4f29db95f4dfbaa5cac18374eaddf91a3c5 SHA-256: ea9e0df396f9f7467912b11777b019a45842b4e6c077928f63eae8bf24f40a9d
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 0.9997

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://kuzutuzo.ru/strik?utm_term=onkyo+tx-nr626+review PDF link annotation
    • https://jonumupemusegiw.weebly.com/uploads/1/3/0/8/130874210/0170dfa.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/loguzivaguw_xulumawel_luvegiwojasuwo.pdfIn PDF document text
    • https://kabukarolezero.weebly.com/uploads/1/3/1/0/131070374/a1e2def64.pdfIn PDF document text
    • https://cdn.sqhk.co/nigudovowa/gcjg2du/hockey_gear_stores_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/jigjcnG/lomivesit.pdfIn PDF document text
    • https://cdn.sqhk.co/pinepopowig/iKjg0Dz/pradhan_mantri_awas_yojana_application_form.pdfIn PDF document text
    • https://zajadibagaku.weebly.com/uploads/1/3/5/3/135341716/d9593.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/iUhdwji/60183465341.pdfIn PDF document text
    • https://cdn.sqhk.co/siboxowimu/hqGPUif/vebawikuke.pdfIn PDF document text
    • https://wigitofeza.weebly.com/uploads/1/3/2/6/132682623/1662036.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/tawifolaxixajirafo.pdfIn PDF document text
    • https://zovuwiveja.weebly.com/uploads/1/3/4/8/134880504/kijudenote-nutimepegus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_36824dc0c94b45ba8feb867e5f4d75a3.pdf?index=trueIn PDF document text
    • https://11473e6a-2925-43ee-99c0-54fa362fdff5.filesusr.com/ugd/1b0481_7c5c1b34dd9f43d1acb137c1533547ba.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_6850cee8a892414a9d9bb5c0572ffbc2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c5ab3d5-1b34-4038-8609-bdfd0616aee3/doximed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f30975f8-15f5-4544-b2e6-6850bb1a7aff/6345019950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3626f9a5-7337-45b8-9019-d0066454a601/55648750145.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_3690c701e4114d0997d9f72fe25f0f3e.pdf?index=trueIn PDF document text
    • http://pekiluji.atwebpages.com/gisogojapusoxu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 4988 bytes
SHA-256: f04a4505275ad22872dd2896e78d6350b43155068f442569ab9c0e8cc8bd48cd
font_01_sfnt_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 11256 bytes
SHA-256: 18d15c7ebc2421d47e1e9797d78808f5b7427a55720ef506906149dd6486596d
font_02_sfnt_off00012596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3