Malicious PDF — malware analysis report

Static analysis result for SHA-256 2543ffa7799fdd9d…

MALICIOUS

PDF

69.6 KB Created: 2021-06-06 20:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 64aaf0ebf3cb12ac58017b8833d79e1b SHA-1: 98f2fade70e11cf3bcbf47bc9064d9d362e10672 SHA-256: 2543ffa7799fdd9ddbfaace670af770d4e3bf43eac4dbd4ac101c9fe8386cd5a
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://garglob.ru/pbw?utm_term=avery+file+folder+label+template+2180 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4527164/normal_6021baca6f935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530070/normal_60119afdd8f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_605c6d35597ce.pdfIn PDF document text
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/78201eda2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500001/normal_5feee69543932.pdfIn PDF document text
    • https://xelusivixofon.weebly.com/uploads/1/3/5/9/135958974/ponifax-melid-vigodamu-sesefogetagaxom.pdfIn PDF document text
    • https://fiwazapabuw.weebly.com/uploads/1/3/4/3/134357015/6475900c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jedilukiwo.pbworks.com/w/file/fetch/144581598/fizikokimya_3_ders_notlar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e446319-83d2-4743-aa5f-15fad03f9c50/dekojuzalamonake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d89acfdf-2deb-42b7-80a1-ee2cc1783244/char-broil_2-3_burner_rip-stop_grill_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf99d2c-3909-48e8-8069-17131918ba44/98347801982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22ecf0f8-caa6-42be-a55d-d46b8019333e/treasure_island_hardback_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50273b56-dcc5-4d2f-b8fd-6ccdb5768c49/25129269934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0d58478-4e54-47c2-afa2-94b1de9ab992/nigavowas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c82d5fe-7113-4403-b4fb-f649504cb58b/kaplan_online_mcat_prep_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c69c5d1-e680-417a-9d15-7a6edbb36166/angela_carter_bloody_chamber_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aee39ae-8f14-4011-8f55-6cfcd04a8fff/33705557941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e4ef83-dd76-4497-ac2f-9082a5749142/find_the_orthocenter_of_a_triangle_with_the_given_vertices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63fd9dd7-7ec4-42b6-9d3b-15ac5bfa3bce/origin_and_development_of_sociology_in_india.pdfIn PDF document text
    • http://ruwezebom.pbworks.com/w/file/fetch/144427692/24602395801.pdfIn PDF document text
    • http://zuwuzemoj.pbworks.com/f/19600109196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88160375-6f7e-444e-9fc8-d5601e1b4de0/nijagalowikurum.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/puzzle_mania_book_oliveboard_free_download.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/casas_cachoeira_do_bom_jesus_florianopolis.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_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 5820 bytes
SHA-256: 8b1b4d48519f8e93c861970dd8cfb9e633d7c4e88091ffb2fad7212d4c7d0978
font_01_sfnt_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 9764 bytes
SHA-256: 4376aae77af7cdfbdc811778a866134a8b423fabe429dc24ab97ccd1ede2563e