Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf547a6a6a1eeec…

MALICIOUS

PDF

75.6 KB Created: 2021-05-28 23:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7729a4d7ab2d706a583373f52052da5e SHA-1: 10124310f3e94b7af3809c4a288716971b437ce4 SHA-256: aaf547a6a6a1eeec8cf1b62f226db4b0834505d9bfd2546b821e572b11410c0e
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with at least one, https://seumenha.ru/strik?utm_term=3rd+grade+length+measurement+worksheets+grade+3, being flagged as potentially malicious. The document's structure and the presence of many external links suggest it is designed to lure users to potentially harmful websites, consistent with phishing or malware distribution tactics.

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://seumenha.ru/strik?utm_term=3rd+grade+length+measurement+worksheets+grade+3 PDF link annotation
    • https://sapakuso.weebly.com/uploads/1/3/5/2/135297556/5dc4b2b9ce2.pdfIn PDF document text
    • https://libuxematofep.weebly.com/uploads/1/3/1/0/131070581/fugagu_povubowufexobiz_jepag.pdfIn PDF document text
    • https://watumuguv.weebly.com/uploads/1/3/2/6/132695830/fexofalu_jukutitu.pdfIn PDF document text
    • https://lovefuzabuzonif.weebly.com/uploads/1/3/4/1/134109130/aa914.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/kiwinixesewur.pdfIn PDF document text
    • https://bimotozego.weebly.com/uploads/1/3/4/8/134885309/9321770.pdfIn PDF document text
    • https://binolopokam.weebly.com/uploads/1/3/1/4/131484395/sutijudanunazi_vokalo.pdfIn PDF document text
    • https://jidamusalaf.weebly.com/uploads/1/3/4/3/134378250/natawavozegasali.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/a2e64c06-35fa-473d-9c3a-5e713fc083a2/como_crear_un_archivo_con_varias_imagenes_escaneadas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f96c169-c58e-4c23-8390-673c3fd37640/58220688857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3931a30e-d691-42d2-8d12-5e6c78e65883/67366739776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f219de7-e778-49b8-a176-85ab1c0bef21/conflict_desert_storm_1_pc_game_free_download_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6e2225-4b30-4ead-928c-687cb5b8fba3/geometry_dash_online_unblocked_at_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e6cd909-4193-416f-8247-cf24f1d5de64/79145674620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebdadf0a-3add-405d-be99-399f00b774a8/rca_rcr414bhe_4-device_universal_remote_control_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e110f8d-95ea-4138-ba98-890c9c33c5ca/black_and_decker_hedge_trimmer_cord_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4589cdb0-b0b3-4492-ab6a-850717eca444/harga_mixer_mackie_24_channel_original.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3976fd6-c3c6-4fd7-bb1b-af8ae19a77e8/2008_jeep_grand_cherokee_crd_reliability.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d364157d-8489-4006-8308-5395c36f7e46/sareva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e8e97f-81d2-4e28-bfa3-9e4dbf3535cf/puissance_et_nergie_lectrique_3me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c18a615c-cd99-4c4b-bfda-f34e71ff1205/how_much_do_social_workers_get_paid_a_month.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81cefd7c-9f0b-41dc-964b-c7647bcf23ba/multiplication_table_worksheets_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf9ae10-2f8c-4c63-9240-b6d909912cd9/how_to_use_attachment_on_hoover_steamvac_dual_v.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2958ea13-fb87-436c-b93a-cbc33aa15763/what_are_the_characteristics_of_minor_games.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_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 5464 bytes
SHA-256: 858e9e8b42e09ae495fdf9ece5ad0bf8488767bc98bc6fb360cf22dc4024b4fa
font_01_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 10532 bytes
SHA-256: d3091f0542beffbe3a1a5847433290be17a34f2c7a596f0436f47f9f1ffc538c