Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b4c319fad090ec…

MALICIOUS

PDF

78.7 KB Created: 2021-05-01 21:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d21ac3d11e21e75bab00a04c46cee31e SHA-1: 846e4ea3337d837d3c6620590bff07f692926eda SHA-256: 13b4c319fad090ecc41e17f1578bc1f89190cd640dd85cb55d816923e1e7d54e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 0.7433

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://resalured.ru/strik?utm_term=dark+souls+3+bosses+ranked+by+difficulty PDF link annotation
    • http://funseeds.site/basic_differentiation_formulase9zvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_6031e11fca43c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_601ae3d7c8332.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_5ff196e23d137.pdfIn PDF document text
    • http://profit-makers.club/simple_best_tomato_sauce6tn4c.pdfIn PDF document text
    • http://brumbum2.xyz/vugibaxajenamotewnnna1.pdfIn PDF document text
    • http://lnstagramverifycentre.com/benesixor1j8l.pdfIn PDF document text
    • http://garantiya62.ru/dixobaneocnjw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5fe150e7cd114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366628/normal_6003b29d8ba93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_8d0262476ba94755af86db08cd8c94d6.pdf?index=trueIn PDF document text
    • https://adea4596-07c4-4c45-ba97-107779ed6dc5.filesusr.com/ugd/5bd9e2_68bb8a29d4a046bda3814c0dbc1e0e12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/android_imageview_onclick_animation.pdfIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_c63cd33a7f09499f8d1191a5705c39bb.pdf?index=trueIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_6cd5192832b8426bad7b87dcfe7a9a07.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_51f284e3cd514b36bf8b54fad2b91e4d.pdf?index=trueIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_566fe2bf70f9462193e3697661a92c4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xesigeze/niseditenikubigaxe.pdfIn PDF document text
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_f4d975e7ae5344108df81c0ed463de88.pdf?index=trueIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_143feeb378a944efa84a077c040da9aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/bluetooth_computer_free.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_a1b889e5eb36410980e42db563f03bf2.pdf?index=trueIn 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_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 5484 bytes
SHA-256: 85c6b7cf9efba0e2547fd3626454f98c69c32bcefb7efe1617b639123d3c9668
font_01_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 11876 bytes
SHA-256: 2189b7071cdebbfe5dfdf63f1ea56e264777fa17750ff94e5287f7404805965e

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