Malicious PDF — malware analysis report

Static analysis result for SHA-256 28720699bf2a90b2…

MALICIOUS

PDF

71.9 KB Created: 2021-04-04 02:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d876fd1b95ca7922e1f23730d3a3ee94 SHA-1: 948d35fea8a59d08922b528e2fa8c7206c7e9d4d SHA-256: 28720699bf2a90b27ea152a4bb6a6c6bbe8105be92144d44547adf6924e12339
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://jottigo.ru/award?keyword=takeuchi+tb216+specs+pdf PDF link annotation
    • http://xuritepizib.mygamesonline.org/gazojinikedikozukeleji.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/fJicSKv/teach_yourself_c_in_21_days_second_edition.pdfIn PDF document text
    • http://nofuwev.iblogger.org/xalijurewava.pdfIn PDF document text
    • http://takaweri.mywebcommunity.org/buffalo_dairy_farm_design.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/benowurer.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/15337869242.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/epeqjcG/basket_ideas_for_raffles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_b978488eb5df47608b16bc2af17d4f8c.pdf?index=trueIn PDF document text
    • http://weparaxopulo.atwebpages.com/oscar_et_la_dame_rose_sparknotes.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_044d408588b942a68a13b2c46ebf9ace.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_cb26c435765446179c2efe574e9350b7.pdf?index=trueIn PDF document text
    • http://zugosixefi.epizy.com/how_to_do_exponents_in_order_of_operations.pdfIn PDF document text
    • http://dipomik.epizy.com/93212586653.pdfIn PDF document text
    • https://de7eff9d-5c50-4122-bb99-ee112abf7a8f.filesusr.com/ugd/db8f21_3062fabcd28e4271a434f892e9f4de6e.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_b3e642d345e743f7803e1014cb07b881.pdf?index=trueIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_8515444210ef4c458cc850b53c602570.pdf?index=trueIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_a2853e6aa0724a28962f2f1ed2373c4b.pdf?index=trueIn PDF document text
    • http://rimiwomo.epizy.com/body_shop_sheet_face_mask_review.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_02412f4623594477990829b13b57d7a8.pdf?index=trueIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_ab43865d11e843b481f9a49117493b0a.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_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 5608 bytes
SHA-256: 81455cb46ca65a03ee099a377bcdb055a6f51e0bf224d13adb75b69fb58e7ff9
font_01_sfnt_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 11084 bytes
SHA-256: 600314d7c973c0edb08bc153a76b549180179fd2a2f4f8fd730b14dea4316433

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