Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e88044e3320707…

MALICIOUS

PDF

83.3 KB Created: 2021-03-16 23:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f8536bbca15e84abb30dc1614386c539 SHA-1: 94c47ed3f2f6cdf49ec26dde161a4f3d1ad69fa9 SHA-256: 92e88044e3320707636432360b1744a1deac04439bb74a028cf3b3fa16567e51
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 0.9994

Heuristics 6

  • 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
  • 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://jumiwimov.ru/123?utm_term=notability+app+pdf+annotation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384821/normal_602ae38cf2033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fee08140de60.pdfIn PDF document text
    • http://pukutabutosu.22web.org/fibewefuleromevirikenodud.pdfIn PDF document text
    • https://rurinigumiza.weebly.com/uploads/1/3/5/3/135350695/678f4a00d7abeeb.pdfIn PDF document text
    • https://ximapufem.weebly.com/uploads/1/3/1/4/131437784/gaxemipinuwavu.pdfIn PDF document text
    • https://notowupoguja.weebly.com/uploads/1/3/5/3/135316513/vokukodarenir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_6027165255942.pdfIn PDF document text
    • https://vinaxana.weebly.com/uploads/1/3/4/7/134725794/d7e088e7918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502511/normal_600f8bcdbde0a.pdfIn PDF document text
    • https://wumigativagulam.weebly.com/uploads/1/3/1/6/131637174/gobib-xazijovu-liloze.pdfIn PDF document text
    • https://verulofu.weebly.com/uploads/1/3/4/0/134012380/6dd17.pdfIn PDF document text
    • http://mamunetosi.iblogger.org/ios_on_android_software_zip_file.pdfIn PDF document text
    • https://fadegedisumobe.weebly.com/uploads/1/3/5/9/135992854/doxonokami-zuretabe-nukada-rinuf.pdfIn PDF document text
    • https://dilewujolar.weebly.com/uploads/1/3/5/3/135308995/840194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466659/normal_6030d496c0262.pdfIn PDF document text
    • https://zoninezazazi.weebly.com/uploads/1/3/1/0/131070362/8579063.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_3421e355e5ac4fa1a18c2083fa6fd4e4.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_14fa00970e6f4938a04c05dae68e99cf.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_621afaa05dea415095ed25cdb44d0232.pdf?index=trueIn PDF document text
    • http://benamow.myartsonline.com/why_is_there_black_marks_on_my_teeth.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_a156d5e05cce4239ba18acaf99981e03.pdf?index=trueIn PDF document text
    • http://dejibokakar.onlinewebshop.net/behaviorismo_educao.pdfIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_cfe359a93a2f4aa8b4fc4b12b350c081.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_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 4972 bytes
SHA-256: 2c5210ef7ff9f45c184e74c28e2366c815dbf6a76cf8ff7b48dcc0511af68798
font_01_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 11928 bytes
SHA-256: 9bd9819b5340fbf0692b9aa2b2d1907f5e9d2e84e5f2ba6e4e4df7767764ecd0