Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9da0dd1405b973…

MALICIOUS

PDF

91.1 KB Created: 2021-02-21 06:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 88e19c068087d561df3e63919b614119 SHA-1: 7160ae18ac3969200bfd5e9ebde96ffa6e45f32b SHA-256: 5e9da0dd1405b97337f57a5110886418d2f15125065a9897d434e3d5d2c73281
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spam tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=derechos+humanos+en+estados+unidos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415309/normal_601094085cc9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_60127a83e6069.pdfIn PDF document text
    • https://vifomamup.weebly.com/uploads/1/3/1/1/131163898/1128809.pdfIn PDF document text
    • http://xozonline.ru/iowa_code_section_232.21lqzm5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413468/normal_60253da90cd85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_601a6428c4e5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_60109f7f1c988.pdfIn PDF document text
    • https://numetoximo.weebly.com/uploads/1/3/4/7/134717633/lapapi-xawasatut-jofuwavepidi-zuduwifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407782/normal_5fd900fc9d1df.pdfIn PDF document text
    • http://spainsale.pro/6342348551855x2o.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/3130144.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492588/normal_6008b338c218f.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/lilutomutagubejofari.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/063458d90ddb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_6026d99b4f862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485809/normal_5fd9cc0c126c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409417/normal_5ff594609d35d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486053/normal_601f8874b8db7.pdfIn PDF document text
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/483a1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000124c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 5144 bytes
SHA-256: a6c17f98485d669aea3bb5367ac0b751f4028c7bd1fc6e22cdf8921c5cf82e6b
font_01_sfnt_off00013613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 12136 bytes
SHA-256: 066c257504938cc303ef24b2c4e0ee0ffe8249f37abd6d7e1cce4053090934fb

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