Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c802591849573e…

MALICIOUS

PDF

73.9 KB Created: 2021-02-07 23:08:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d6573d236e8e1880fe32e0a7720c8f56 SHA-1: c02dfc4df6b89fbca88509ec415a63162189217b SHA-256: 28c802591849573ee21a75dd128a600e308b8d21e36fa44486df05ceecc6e8c7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains or Weebly subdomains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this assessment.

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/123?utm_term=davenport+central+football PDF link annotation
    • https://dezegumi.weebly.com/uploads/1/3/4/1/134108828/8457445.pdfIn PDF document text
    • https://jeludumekidi.weebly.com/uploads/1/3/2/7/132740852/958801.pdfIn PDF document text
    • http://limaxinsto.xyz/algebra_worksheets_for_grade_8_withhj5x3.pdfIn PDF document text
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/1f12abe7cdb.pdfIn PDF document text
    • http://xviiivbgz.com/vw_golf_gti_2018_owners_manualulwyf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449771/normal_5fe7dc939db64.pdfIn PDF document text
    • http://udilische.club/benakadobuberujermpr9.pdfIn PDF document text
    • https://megigoxifiwovom.weebly.com/uploads/1/3/0/7/130740625/nexid.pdfIn PDF document text
    • https://sefaxamijewosaw.weebly.com/uploads/1/3/2/6/132682716/7159271.pdfIn PDF document text
    • http://santand-es.com/turedaxugeripopejojotiln6ar2.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/wupuxus/types_of_management_accounting_reporting_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/92755349582.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_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 5032 bytes
SHA-256: 1867785a6d541835c475ecccda4c34de088857e35c6b9f978c045bc8ba952aaa
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 11324 bytes
SHA-256: 9b780629774d33fbdd5b1096704213d0cf77bdab9f3a81648a76f95afaecf322

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