Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9ef9316dd4befc…

MALICIOUS

PDF

78.2 KB Created: 2021-05-03 01:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8512c0ebec9793b3fb9cc5dfdb54ef6d SHA-1: 70ae905228f99405cbefc827cd301cbf1eaa8f24 SHA-256: cb9ef9316dd4befccd1ec7061d76e3568f91adcfaed45bccbccc10ea17575ae9
186 Risk Score

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 0.9991

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://leonvi.ru/strik?utm_term=used+miller+bobcat+250+nt+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469824/normal_6026a95e52271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444874/normal_5fede6cc7ead9.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/ef8f68f9c2fd.pdfIn PDF document text
    • http://puwaxevajineluk.iblogger.org/53387733137.pdfIn PDF document text
    • https://povijovo.weebly.com/uploads/1/3/4/4/134463476/5148296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387036/normal_60107fa9a7d87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fec09a2269a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505687/normal_6007d3ba227e4.pdfIn PDF document text
    • http://buxizofi.22web.org/how_to_use_braun_ear_thermometer_6500.pdfIn PDF document text
    • https://xowozasa.weebly.com/uploads/1/3/3/9/133999953/513bdcfc2a44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb9d9d3-1f25-489b-945d-ba6029fd9242/how_to_answer_who_are_you_question_in_an_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9240d2d1-78ec-4a4a-9e50-b5667761f5a7/nizutopizaxuxirig.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/medscape_psychiatrist_compensation_report_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d25e91c-04fe-495e-b1b7-04ce14d71bfa/what_is_the_second_book_in_the_darkest_minds_series.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/babylon_ad_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a91dd7-d128-488b-8a07-8239122267e5/how_much_does_a_samsung_tab_4_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6af1c5f-0c8a-4da9-b4c4-6ba1f106dd5c/rezikitunogunun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b504f158-3e31-49ad-b3bc-d3f6c37e38f1/31597153715.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/buvobamixoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf2f7aa-cd76-41a5-ba63-03bb3b1ca825/explain_environmental_impact_assessment_with_its_steps_and_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/680a01af-63dc-4730-9baf-82807ad6d56c/musical_scripts.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/27441023719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59f07c8-61ce-4e93-86ad-35acf1dbccde/junalu.pdfIn PDF document text
    • http://baloxes.epizy.com/sovinuselumitanukoxobote.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_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 5696 bytes
SHA-256: dcf0dcf85bd91874dd720373e9b187ef379c924072b2d3322297e4a67623c95a
font_01_sfnt_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 12228 bytes
SHA-256: b06e870e34b03cddc11d9b4033c9ca1f126ccf13f71a12890c99d2d38ec1f84c