Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7de18011e2a7922…

MALICIOUS

PDF

75.3 KB Created: 2021-04-30 19:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b097571a797a961d0ba9a845390fec5 SHA-1: 9923417a8d37bd721dfae1f3df3057b8a2dc4284 SHA-256: d7de18011e2a7922b7869dfdeaa6abb92f38adb4661411fc43e18b1bfdcb6837
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=what+religion+did+babylon+follow PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459328/normal_603beaa394ebc.pdfIn PDF document text
    • https://vipugexisixow.weebly.com/uploads/1/3/0/7/130775501/1547552.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/nakij-gesobukefufo-xumeluzalu-fisemaj.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumula/idhdJuK/99878874033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_606e92fcafea7.pdfIn PDF document text
    • https://volilisaxox.weebly.com/uploads/1/3/1/4/131453747/66e1b606af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_604d266d7b090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_6015dd586e0c5.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/igfishf/navodaya_9th_class_online_application.pdfIn PDF document text
    • https://rosajojuzexoked.weebly.com/uploads/1/3/0/8/130874599/xebiwabamoxeb_sisuvajuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490366/normal_60500c6189377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_60178ab7e959a.pdfIn PDF document text
    • https://pubotaxo.weebly.com/uploads/1/3/5/9/135962756/voboxeluxatefor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_6011eac17206d.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/ijsgcOw/wuzin.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/1291dbb9.pdfIn PDF document text
    • https://cdn.sqhk.co/xolizoxime/1J7Ghix/freedoom_app_github.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496602/normal_606050fd57a2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458621/normal_5feeba325af50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451221/normal_603207ca52ca7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_605efd6a849b0.pdfIn PDF document text
    • https://dobuzitususuv.weebly.com/uploads/1/3/4/4/134470967/5100dd2f58f8.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/rghe9ja/the_real_wolfman_documentary_history_channel.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_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 5340 bytes
SHA-256: 8f26b4527eaa109f46de3bb2d862d2c67ed7037d01fc8e1aafda5b1f1407e72d
font_01_sfnt_off0000fabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 11092 bytes
SHA-256: 32edff72572f73e02124eee9914d679484320320e23dae2faa3c7fe26560ef38

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