Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0a0d5f2148f6e8…

MALICIOUS

PDF

87.0 KB Created: 2021-04-10 08:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 19892ad61af0b8d322eadd39cb260965 SHA-1: cf1240a89d7eeea7e098ed6ce36a0a0cd79377d3 SHA-256: 8b0a0d5f2148f6e8a682d08cea58ddd88512e603d813fdd7c079e84f384028e1
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 0.9996

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://nipisod.ru/strik?utm_term=dnd+5e+critical+role+campaign PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417206/normal_600afe10c5c7b.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/kojudunogufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_601bb75acf2db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470523/normal_605d8c13b5fd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471081/normal_5ff684cf466f9.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/army_alphabet_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505125/normal_604fcd1b9f57d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_600a85ab8f4a3.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/dell_latitude_e7450_power_connector.pdfIn PDF document text
    • https://lakizixobatit.weebly.com/uploads/1/3/4/3/134325667/c8ff25146f64.pdfIn PDF document text
    • https://xadiditenir.weebly.com/uploads/1/3/4/7/134763486/sikom_lituga_xegefigixafan.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/jhj1zIx/diamond_clicker_earring.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416672/normal_60517a724314b.pdfIn PDF document text
    • https://cdn.sqhk.co/tibatojo/jhnjfGW/rope_hero_frog_ninja_hack_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vexabimumemig.atwebpages.com/alopecia_androgentica_fisiopatologia.pdfIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_74bc0b46753e4de698379ad63998bdf7.pdf?index=trueIn PDF document text
    • http://fepetixapokurob.myartsonline.com/51999798073.pdfIn PDF document text
    • http://kopolug.myartsonline.com/wuginawibilukezijanega.pdfIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_d610e2f8ba914496b7f3452c76d6d568.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_bbd7fabe966f43d8ab922c2619ed0199.pdf?index=trueIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_ada22b6ddadf4db1a6a31fbcecd85721.pdf?index=trueIn 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_off0001137f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137F 5336 bytes
SHA-256: 016ca3f7bd1ebd7af24838e13b7e2f624b6c745aae5543f9b68be447ccbc4ca4
font_01_sfnt_off00012599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12599 11456 bytes
SHA-256: edfadc7a1114f00b5046df935cdbb79aa2f3c91f1368fbfd91cc85b8892f45b4

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