Malicious PDF — malware analysis report

Static analysis result for SHA-256 62af8cb0a73ba1fb…

MALICIOUS

PDF

77.9 KB Created: 2021-02-20 05:50:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6d7abc3331dd88292d50a20bd7543a12 SHA-1: f01344e4f667acb9fe7c99d76fee41c53970c197 SHA-256: 62af8cb0a73ba1fb3dff82a225f570d07446e609b80f1c2d91875ddc5c17ec96
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious or deceptive 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://druttle.ru/strik?utm_term=what+are+the+48+laws+of+power+by+robert+greene PDF link annotation
    • http://italysummer.space/grace_brethren_christian_school_uniformbn49u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462345/normal_601bf032d8f3e.pdfIn PDF document text
    • https://werafapotavide.weebly.com/uploads/1/3/0/9/130969473/zamemotato-vabijemafi.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/ieLgTgj/quikr_search_jobs_mobile_cars_home_services.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470523/normal_5ff4c4bf5fb93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_5fd369c8ddfaf.pdfIn PDF document text
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/xesawupiva.pdfIn PDF document text
    • https://kidodizaramaba.weebly.com/uploads/1/3/4/0/134096495/zetuxutad_dusipuweraruzi_tetuf_fonusinux.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/7940341.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/5699837.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/8796403.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/ieUVgws/sezoraxijugirugafirejuv.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/8951293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390382/normal_5fe351bb55fb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fivajopafovile.rf.gd/deere_and_company_annual_report_2016.pdfIn PDF document text
    • http://nemagigorame.epizy.com/zenidadebujutinipefexa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 5792 bytes
SHA-256: b8cf163b822a0ec8c8b96309d61b7bd02b061565efd903c51cfcfd1614cda901
font_01_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 10592 bytes
SHA-256: 99c8c119b81c565b765624b6ed3802caebfc06b317ebafa46afa5cba69accaf1

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