Malicious PDF — malware analysis report

Static analysis result for SHA-256 495b9f34ea642ceb…

MALICIOUS

PDF

71.7 KB Created: 2021-03-16 04:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c493ae8b6e52179be02257cde062aa1a SHA-1: 532500409eea759c694605c29c9f3336cf6a5678 SHA-256: 495b9f34ea642ceb8c2ca72f4209841ffe8ebdcba6e78b710bea4829d8e47e0b
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 0.9998

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://dugedepap.ru/award?keyword=internet+of+things+applications+pdf PDF link annotation
    • http://xoxosedefoxadu.mygamesonline.org/calculus_crash_course.pdfIn PDF document text
    • http://kunakeveguf.iblogger.org/83088409603.pdfIn PDF document text
    • http://kifikawi.66ghz.com/nurodotewiweberav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_ecc5bdb06a1a4d4a85a28d485d9bec67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4ce05f-5edf-4336-9a9c-2e9dd5ce9d07/by_what_factor_does_the_kinetic_energy_of_an_object_depends_on_its_direction_of_motion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0250392-a5cb-488e-9d26-0c544743e502/34352635117.pdfIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_0e4c732796454e1289844d33ce1cd447.pdf?index=trueIn PDF document text
    • http://ramimivojis.rf.gd/do_you_want_to_be_average_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e125b828-d85b-454a-adca-42a437ec3e47/zelavowaxofumubofob.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_5afa30deb5f245228948173e45b1e521.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01843029-ca21-4f2b-ba2d-cb6af07dbe08/61886968521.pdfIn PDF document text
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_8279f4af6ba646569caa02adc33b0675.pdf?index=trueIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_5fff021bd9bf4ff8b617e6b4c32bd9ee.pdf?index=trueIn PDF document text
    • http://bexovivuvere.myartsonline.com/lightning_arrester_catalogue.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_cda124c003a845f08eb6bda0e68ee850.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3313af6-50ca-487b-8cb7-d5c16619150d/vepuwogofujuja.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_8d1513246fb64d8490ee097b4a04c704.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe65dad7-a9e6-4593-82c7-ceb7eb0a3253/gejisabajozesixebigi.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_552506b3fa584d6cb495b765f661863d.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_9f2f6650ebbe43eaac1cae39c8c94dd7.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_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 5356 bytes
SHA-256: a7a3a85ccae75be4edb84ca50ea6375fef5355d089d271bb96fa5e3fdb598235
font_01_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 10692 bytes
SHA-256: 47d761efed7010b7651d429608921010909ba0e65e9bc3cc0058c37e50531303