Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecd571aa04dbb48…

MALICIOUS

PDF

72.7 KB Created: 2021-02-25 22:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 88cb38d4072e82a5851b8a7e9ffd620e SHA-1: 21788abb352b493d7d39f8fe6dbd0fe780bc76c4 SHA-256: eecd571aa04dbb48b22307666119cc8cd7c53bb64adbc37435ee70d8dc2c8c75
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://baarspo.ru/strik?utm_term=how+to+do+multivariate+multiple+regression+in+spss PDF link annotation
    • https://pusudojajepi.weebly.com/uploads/1/3/5/3/135322366/6bd24c26c3d50.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/Aehg6he/visa_airport_companion.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/gji5jbu/under_a_spell_layer_cake_fabric.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/1504245.pdfIn PDF document text
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/1184697.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/8b57f.pdfIn PDF document text
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/657525.pdfIn PDF document text
    • https://vifegozotamideb.weebly.com/uploads/1/3/4/2/134236473/kasovofew.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/Lihghhh/7452971466.pdfIn PDF document text
    • https://memuvarava.weebly.com/uploads/1/3/1/3/131384606/sikefovebowox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489834/normal_600b6d183068f.pdfIn PDF document text
    • https://fojivefejiba.weebly.com/uploads/1/3/0/7/130775352/3a97e3a5f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483839/normal_5fe27d6e524ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/fufogux.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/risc_architecture_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/purijesixaroviwiperogu.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_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 5392 bytes
SHA-256: 3d7e562bd9a5a7b326fcf398a2619744257e3ad0d2b79ace00eed649daec8156
font_01_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 10132 bytes
SHA-256: f5d1dea68cb961ea853ceca26d984829ee67ff3f1a2597e94f98127df523a1fd

Open this report in the interactive analyzer, or submit your own file for analysis.