Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b19142be7fc5e6…

MALICIOUS

PDF

72.3 KB Created: 2021-05-31 14:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: df253b7e3f153cea521872de90e65398 SHA-1: 0d2e8fe7a49b2d6f6cd69159c67c18bb703d80f3 SHA-256: 87b19142be7fc5e6f6c1f55eb9190bcff3b8fa815d71856a49807b0ae9d2174d
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://xezojetit.ru/123?utm_term=experiencing+god+youth+edition+leader%2527+s+guide PDF link annotation
    • https://wegefaraza.weebly.com/uploads/1/3/4/7/134703567/1132527.pdfIn PDF document text
    • https://vifesomojijafi.weebly.com/uploads/1/3/4/3/134337648/45de9f816da.pdfIn PDF document text
    • https://pozefixinez.weebly.com/uploads/1/3/1/4/131454190/5fb396c98.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/8208446.pdfIn PDF document text
    • https://figejarorosuwe.weebly.com/uploads/1/3/4/4/134433037/dutidotovezu_jekuwuri_zatobufeweza_supujijodu.pdfIn PDF document text
    • https://wagezulixi.weebly.com/uploads/1/3/2/6/132695300/62017.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/tikagalefanuvon.pdfIn PDF document text
    • https://topitodowel.weebly.com/uploads/1/3/4/8/134890479/benezazegi_xetonivo_tivunoguwegidud.pdfIn PDF document text
    • https://mujabimebedegi.weebly.com/uploads/1/3/4/2/134234846/60dbe5e.pdfIn PDF document text
    • https://kubuvapag.weebly.com/uploads/1/3/0/7/130776206/pudasizuxetevefim.pdfIn PDF document text
    • https://ruwawowek.weebly.com/uploads/1/3/2/7/132712040/c65701.pdfIn PDF document text
    • https://timitadenemegi.weebly.com/uploads/1/3/4/7/134728598/fojutu_fusiwob_nurapiwufukes_jejelizoginoge.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/565ee2b2-660d-40a9-9e13-ab0c615eab90/nebaraz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7bb5089-11bb-4fe2-8867-ce398fca2ed6/jubiwotevusukunatulerivon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb72d11-0de5-4808-b84c-df1b43f27600/balekikasezizub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df730af1-1f49-4631-9707-3b60aac72bfd/28568588659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ea6a6a-213c-4b74-8283-7dc8a5bd2608/30705788391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6c8f20-0fa3-48d4-98c7-aa7c547fd693/how_to_repair_sump_pumps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c62f087-e729-446d-adfb-c9f7bc6f9958/lapejideniroz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc9d1933-1e9c-499d-bd97-a666e4ac675e/hoover_windtunnel_rewind_vacuum_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dce6592-6806-4ebb-8d37-00f399e69f95/epson_perfection_v370_photo_scanner_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e31624-88b2-4f3c-a6c4-ec300806c7ca/the_3_body_problem_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4869ea6-9324-43f7-82e5-bdfe6a96632b/frankenstein_shelley_first_published.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53f01a2-b4a3-4e45-a799-791a89d4a935/73224031683.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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 5496 bytes
SHA-256: 380aaa6eced76263f660d5f2da7312adc42bbca133113ca01bfe288115af1edd
font_01_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 10608 bytes
SHA-256: c40320590635b300a2de025160b2489b1a6e93f3540fae95cc047c7677ab9d7c