Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae4a43dd3dfd5a0…

MALICIOUS

PDF

71.2 KB Created: 2021-03-28 23:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 09f374bc979947aa1340dd18b721657a SHA-1: 149eea1a761fdd6ac2ce50411b23e96e674cd027 SHA-256: 4ae4a43dd3dfd5a0f6a5ece8380386277d43420f9672857ecc8b67e0b06e5090
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9998

Heuristics 4

  • 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://zajinet.ru/wix?keyword=apkmirror+fly+gps PDF link annotation
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/718b6.pdfIn PDF document text
    • http://sk-anker.ru/alexander_henderson_ielts_reading_answersjoyf4.pdfIn PDF document text
    • https://kokubuzo.weebly.com/uploads/1/3/4/0/134017800/dopaxegajepa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384831/normal_5ffc352065850.pdfIn PDF document text
    • http://okstore.info/poredugusuguguvajabaguuotjs.pdfIn PDF document text
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/de04b794b3aeec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481417/normal_604122672de83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365638/normal_6001ba0d9ad91.pdfIn PDF document text
    • http://shop-profildoors.ru/hp_officejet_4630_install_scan_to_computerfpq8d.pdfIn PDF document text
    • https://juvikawupuw.weebly.com/uploads/1/3/1/4/131409017/1bcb7c5fa5a22.pdfIn PDF document text
    • https://xexalidifiso.weebly.com/uploads/1/3/4/6/134685587/ee3cc2d6c776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_6051895c19fe1.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393754/normal_60252a8973d8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f0f1f813-f38f-4181-ae3b-26e0838c9447/resumen_corto_del_libro_un_grito_desesperado.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/3ds_max_material_library_free_2012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6edf761-3816-40a6-aa25-1bfce09f9436/us_postal_service_flat_rate_international_shipping.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/ahista_ahista_song_bachna_ae_haseeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f6c6ca-7320-455a-b824-15a84f071cf1/6866350318.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 4652 bytes
SHA-256: fab07da385067125f98f8a563bb8251efc6c8cd32f5be754714da253c6f265fa
font_01_sfnt_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 10288 bytes
SHA-256: fc675a6b445027f95ec3f062e6ed853f1a39e41d0c8b637e8a221523003966c9
font_02_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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