Malicious PDF — malware analysis report

Static analysis result for SHA-256 a945a27550c3f051…

MALICIOUS

PDF

75.8 KB Created: 2021-06-08 20:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 438819d2c4655f5220a5fdfc6cb82e5a SHA-1: ce6d23bae5e0e7d6811b554e94155b5f2468e470 SHA-256: a945a27550c3f05141e706fe1be668d83f87044d94460a162118f2b33f9dc3b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains an embedded URI pointing to a URL that appears to be part of a link farm designed to redirect users, likely for downloading a game. The presence of multiple external URIs and the nature of the embedded content suggest a phishing attempt to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://chcial.ru/pbw?utm_term=ppsspp+gta+6+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481662/normal_5febca96c2ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_606c56bd5d287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_604162bf21e89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475203/normal_602864b355637.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144672204/how_to_download_gta_san_andreas_for_free_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8dee7ea-1591-49b7-b77f-23ecc5b6ae95/83257497389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/383e82b2-24b2-431b-a808-ea161e8a23fc/how_to_get_any_movie_for_free_on_google_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84d891a-ed7a-44de-bc6c-4867225e1270/how_to_take_written_drivers_test_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd224a0-b46c-4799-b751-9abb2f350fa8/juwaxikamabenuvir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45446027-5088-4b07-a08a-1ab3cb9fa21c/3_types_of_services_aphg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8a59f4-22f5-4ad8-ba5d-379fce269796/lixiana_scheda_tecnica.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/w/file/fetch/144747144/unchain_my_heart_piano_sheet_music.pdfIn PDF document text
    • http://ritijix.pbworks.com/f/closed_syllable_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2ad0789-bf50-4fd0-a495-d8ba2d000833/how_to_start_a_toro_521_snowblower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78070183-2854-4ee7-a18f-0b98f63e255d/ge_refrigerator_repair_customer_service.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/594031ba-4468-408f-baae-4bfb0e42da85/tinomuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92fdff1c-2ec4-4d03-b5ba-c0419b7c1dc1/78414986362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d01317ba-e5d4-421a-984d-6eff71d88207/how_much_do_mcdonalds_store_owners_make.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/w/file/fetch/144501399/64107119680.pdfIn PDF document text
    • http://gebetedoke.pbworks.com/f/zegujatibojuwixogi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 5280 bytes
SHA-256: 1032ca28d4d5b0f0f902f4906d8e2d749c8e84d39aec7c72fa86052e7bbde17b
font_01_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 2108 bytes
SHA-256: cd1bbe60a2fe17752ac494ee57533a5b175eb54220e218f27e61068ad08b1124
font_02_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 10512 bytes
SHA-256: 2e4f7056b8a0fcabdfbac1aaf05924f51a26f7c22c8554717914023887d4ef3c