Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8b448aad134266…

MALICIOUS

PDF

75.8 KB Created: 2021-03-26 19:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb339ae42e67062ba35cc52a99d875f9 SHA-1: e7731438bce28b68e65aaeb02917fe591e669e5d SHA-256: 5e8b448aad134266a376ba9b83bd8ed3eb59af7bead18a5dd95ac041c856d214
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary link pointing to a suspicious domain 'seumenha.ru' that is likely part of a link farm for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs and the document's structure suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=capitalismo+y+socialismo+pdf
    • http://jexekiraj.sportsontheweb.net/boxuputefuta.pdf
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/8741260.pdf
    • https://nugivukowunel.weebly.com/uploads/1/3/4/0/134041243/malefop.pdf
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/gegifak_rofulusukefi_lilowogewofimar_sazogojej.pdf
    • http://xebubux.sportsontheweb.net/6617900734.pdf
    • http://vojemodipu.sportsontheweb.net/fifojija.pdf
    • https://pavimukafimedab.weebly.com/uploads/1/3/1/4/131483282/xejedig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4cfb8481-c5d4-44bb-b3c9-6bbd8215c572/8602497756.pdf
    • https://uploads.strikinglycdn.com/files/dc7ed800-7c3e-4fe8-ab93-7ed34a737d7a/lebawa.pdf
    • https://uploads.strikinglycdn.com/files/42d2e6d3-63eb-43cb-82c9-99d8d0452c18/15052545156.pdf
    • https://uploads.strikinglycdn.com/files/bf97232f-a592-41e6-9a2b-1793f66633a9/how_do_i_reprogram_my_compustar_car_starter.pdf
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_39aa6192fe574f2894e4838535c8d33b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0708e60a-1d72-43c0-a766-300bc72e35fa/80061485509.pdf
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_da1e17a0b8a34ca0bc203a8298e24e23.pdf?index=true
    • http://zivexotafoni.myartsonline.com/catecismo_na_igreja_catolica.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc29.bin
3aa2a2a61ac00a01cdb7c4128d028ec0d391172bcbf2a50b9d9bec1ff1b43d1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 4892 bytes
font_01_sfnt_off0000ecde.bin
e418d47d67c78861dd6192c53501cb358bf943e8d84971dd896be18f7a8bdb76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 11812 bytes
font_02_sfnt_off000112c8.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 4324 bytes

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