Malicious PDF — malware analysis report

Static analysis result for SHA-256 444bba6db3b92fb1…

MALICIOUS

PDF

82.4 KB Created: 2021-03-22 10:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4f60c62370b114fbc6b3bc2b46bf08ec SHA-1: 1ec5a5fd31c34aee1b959864dff3214be5a582de SHA-256: 444bba6db3b92fb1d483f1b8c0302d896e8aef74628ac5ce192646cfa649a46e
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting or known malicious redirectors, indicating a link farm designed to direct users to potentially harmful sites. The ClamAV detection and ML classifier further support its malicious nature. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for SEO spam or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+five+fold+ministry+of+the+church In PDF document text
    • https://bamukafigozoxin.weebly.com/uploads/1/3/4/8/134861202/5272b4b5a.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/dujimazinawukugewoxozoge.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/rabejulakored_muledebijunef.pdfIn PDF document text
    • https://gopopozemilin.weebly.com/uploads/1/3/0/8/130874381/sowufuselimemo_lokuzavizujekuj_najas_jopaxulid.pdfIn PDF document text
    • https://maposege.weebly.com/uploads/1/3/1/3/131378999/logumodavo_bokubo_gogakobi_kagod.pdfIn PDF document text
    • https://kiwosadil.weebly.com/uploads/1/3/5/3/135384828/muvixebojaraza-zipoxulu-zikatelufagusam.pdfIn PDF document text
    • https://tunajixawovu.weebly.com/uploads/1/3/0/8/130873758/0a80408474080a.pdfIn PDF document text
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/2003969.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/jededakegugap.pdfIn PDF document text
    • https://pegavuvusejeda.weebly.com/uploads/1/3/1/4/131483027/vepufenen_zinawadeg.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/bellini_intelli_kitchen_master_recipes.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://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_68dc86d76ea749d9b1d496cdb5a7aa09.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_250defeff3494b31b53d45d2b0df5910.pdf?index=trueIn PDF document text
    • http://pexapoxulimexu.epizy.com/livre_guide_voyage_europe.pdfIn PDF document text
    • https://fefcf4f0-bf52-4086-adb3-b788df03f7bd.filesusr.com/ugd/da9d4c_f2e1deaf843c40209017f1ec3c3e4a4a.pdf?index=trueIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_bcb21d50cd09410d9ac2a399d0cbc5f8.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_6b446ae6d1de46de89c9d55e649e31d0.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_eb8a7dc196234df79c1c4738780c929d.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_18bbc119543b46c18a00252213057f60.pdf?index=trueIn PDF document text
    • http://bazepuguxadep.rf.gd/deriwatubavoreba.pdfIn PDF document text
    • http://tujolelulovowew.rf.gd/89222384805.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_0b42c216d1ba433b96d00d2fb0bcbe0e.pdf?index=trueIn 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_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 5320 bytes
SHA-256: 7f15ec7e55021ec18b602be36f639afea9d628c5d8d2cb6abd52a53b51995a0d
font_01_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 10652 bytes
SHA-256: e26bdcf7d4306875a4f352b26d48beb1d2a55583d688dcc19d9e2bd71a4afb0d
font_02_sfnt_off00012dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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