Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ec03c0a5c1aee4…

MALICIOUS

PDF

102.6 KB Created: 2021-03-14 21:25:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6fd3769e387c09f7a33bfc19634cf8e SHA-1: 5aee97cf27e9c99cfa2f6f6b70dccccdf6cbd64d SHA-256: 05ec03c0a5c1aee42540e600ef41dd7d4dbac832dda5b5766d13ae1d82980312
156 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many of which are disguised as SEO content, pointing to various PDF files hosted on platforms like Weebly and other file-sharing services. The primary external link found, https://leonvi.ru/wix?keyword=california+accessibility+reference+manual, suggests a lure to a website that may be part of a phishing or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=california+accessibility+reference+manual
    • https://static.s123-cdn-static.com/uploads/4500882/normal_5fcc6ef2e93f3.pdf
    • https://detaseruwef.weebly.com/uploads/1/3/0/7/130740376/vejezifukat.pdf
    • https://ledunadexaw.weebly.com/uploads/1/3/0/7/130775166/f5c3dcac7cd.pdf
    • https://cdn-cms.f-static.net/uploads/4388046/normal_602d1ca1570bf.pdf
    • https://beserozufem.weebly.com/uploads/1/3/4/8/134864657/b8b8ce8ce32ae.pdf
    • http://saganofodevuset.22web.org/8798638860.pdf
    • https://cdn-cms.f-static.net/uploads/4456166/normal_60255832c16ce.pdf
    • http://pubaninuw.22web.org/xaxapigakujunabezapugi.pdf
    • https://lanufuxag.weebly.com/uploads/1/3/0/9/130969896/301458.pdf
    • https://kikokowenut.weebly.com/uploads/1/3/4/7/134713101/1527371.pdf
    • https://fanamixaxa.weebly.com/uploads/1/3/4/0/134017579/c470581f960a8c7.pdf
    • https://xejinifinedi.weebly.com/uploads/1/3/5/3/135305438/9062430.pdf
    • https://cdn-cms.f-static.net/uploads/4476282/normal_601fffecb7ba1.pdf
    • https://static.s123-cdn-static.com/uploads/4486363/normal_5fefda5d81311.pdf
    • https://static.s123-cdn-static.com/uploads/4417986/normal_5ff260b9a449e.pdf
    • https://static.s123-cdn-static.com/uploads/4473359/normal_5fee7dad7c03b.pdf
    • https://sivoroxusakigob.weebly.com/uploads/1/3/1/4/131453081/lajekonigogitujakuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_bc75dc00d375416bb2a2cdedde83d899.pdf?index=true
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_63e5df2a5e2a4a5b95f053f7e55b7d96.pdf?index=true
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_c6962b179bc04956b536cbdd7977f4fa.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_45d9dfd82d7a4de2a563dbee4fa7d89f.pdf?index=true
    • 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_off0001444d.bin
a36931dd07a909b328699de831146ec4db79d444d5536499d1ab9b346131ed02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1444D 5176 bytes
font_01_sfnt_off000155d6.bin
8a18c21939f3a77a12f16a726c528349137b8ceee4d14f8b79751be83dca4808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155D6 12060 bytes
font_02_sfnt_off00017ecc.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17ECC 4324 bytes

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