Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2ae70f2ab590d8…

MALICIOUS

PDF

77.9 KB Created: 2021-05-30 19:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a54161a66130e8e4328cb90357a5e9cf SHA-1: 27393bdaeb492bb6065d9b72f91d1e4ee311919d SHA-256: eb2ae70f2ab590d88c2fa76287443c4b38e821dc01fcc65e2a5023a4106b7ae6
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URLs likely intended to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest a phishing or redirection attack. The document's content, though heavily obfuscated, appears to reference educational materials, a common lure for phishing.

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://mezovuduw.ru/123?utm_term=delf+a1+junior+sample+papers+with+answers PDF link annotation
    • https://balemimuw.weebly.com/uploads/1/3/4/8/134882120/6211287.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/81a479.pdfIn PDF document text
    • https://kunejadisitezan.weebly.com/uploads/1/3/4/0/134096254/8047538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497687/normal_605f444555309.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/pavewitakazu-vutimeja-torinatati.pdfIn PDF document text
    • https://zedafirulatako.weebly.com/uploads/1/3/4/5/134584693/ruluverenojij_zuvamen_guwuronil.pdfIn PDF document text
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/winixogubi_viwigetir_sopetu.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/kalavijemopiwi-lakevujot-bodet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_600f5a1de4d63.pdfIn PDF document text
    • https://tiputanamadavok.weebly.com/uploads/1/3/5/3/135314880/mozonu.pdfIn PDF document text
    • https://sopopubepomexak.weebly.com/uploads/1/3/4/2/134265445/jevom.pdfIn PDF document text
    • https://jatilupek.weebly.com/uploads/1/3/4/4/134491857/diwuramavojivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458390/normal_606df103e469a.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/sezupobatemoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391599/normal_5fe42a0065f18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379851/normal_5fce52279bfa8.pdfIn PDF document text
    • https://nenimokevip.weebly.com/uploads/1/3/4/3/134336374/7959067.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/molasujexen_wegop_vedugakepuk_bogajozenapew.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/d1f09463-25af-46ae-9887-b77bb977344c/botegesimaxamoratubezow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd22db10-1e61-4b97-bd23-74f7b00dce49/ingredients_to_make_arroz_con_dulce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e9f34ea-88a7-4eca-b8a0-c26e1425a918/41341869491.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_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 5360 bytes
SHA-256: 7c3498bc2b285c7b298c8684ec075358b756dc306cd4a387a07a3774890b3e90
font_01_sfnt_off00010257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 12288 bytes
SHA-256: d84716ad3573ed10298e6451cafe143f19c2a64a97ad14fc7578d0474d3828cd