Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15198a21279bd9d…

MALICIOUS

PDF

77.4 KB Created: 2021-06-13 19:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0ca0d8c45bf03e3b87213ad07882f80a SHA-1: 3ef7728c9d77df63b124be9a25724a167c4213f0 SHA-256: c15198a21279bd9df91c3b40edff300d7c0d310058f3dbc9b50d2016cb8ccd8f
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/pbw?utm_term=how+to+level+up+fast+in+xenoverse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408992/normal_604a258694cd8.pdfIn PDF document text
    • https://razotipelemato.weebly.com/uploads/1/3/0/7/130738732/latelomaxopekubax.pdfIn PDF document text
    • https://dotolisode.weebly.com/uploads/1/3/4/6/134616401/5114328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_6048e0ec17954.pdfIn PDF document text
    • https://pekeweluxema.weebly.com/uploads/1/3/5/3/135304067/rewuvibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385876/normal_606a563e6e0bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_604b0a449cb6a.pdfIn PDF document text
    • https://beponelife.weebly.com/uploads/1/3/1/1/131164358/93032.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376874/normal_5fdef677a3eb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_605a20731115d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485310/normal_605947f528ade.pdfIn PDF document text
    • https://bitoranajezope.weebly.com/uploads/1/3/1/4/131453137/lisanix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_6040558e9f9bd.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/97e585bf-285d-4a1a-921d-fb9959fb0e93/how_to_franchise_kung_fu_tea.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144556038/4221204054.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/f/vavowito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666f5c5a-4059-4e07-b3e9-662458fa1a04/23053799372.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144479532/pirepopagugukijezusi.pdfIn PDF document text
    • http://masigali.pbworks.com/w/file/fetch/145240626/56174149295.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/w/file/fetch/144472275/82864146277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a35faf3-8e6d-49dd-b3f6-46d47bb0194d/kevogebefurapetobowokokex.pdfIn PDF document text
    • http://febigadeviti.pbworks.com/f/stick_war_legacy_mod_apk_unlimited_upgrade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8067e4d9-c077-49b8-8735-361055a56359/equilibrium_class_11_notes_download_physics_wallah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f60e2e12-3fe1-4f34-986f-a04a334b7f77/dnv_cathodic_protection.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144425319/92382146525.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_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 5076 bytes
SHA-256: aa8044223673c8f4f52c01b6dc61b142730c6ca09f38fcbe02523ddc76478343
font_01_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 10648 bytes
SHA-256: ecc26e48a1457679b2cd2ae0fe9afe5a11a565e2735b20160d82675b7da9c15f