Malicious PDF — malware analysis report

Static analysis result for SHA-256 12bc8dbe82d21d7a…

MALICIOUS

PDF

74.2 KB Created: 2021-05-30 19:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 24db03023b55452d47f93ebe8a66440d SHA-1: 9ad8bae48c42510d8fdd184494bbb01928ac4734 SHA-256: 12bc8dbe82d21d7a387475fc45c91d97b8e4a185c2b4b3488bda93fac64dd26b
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 0.9997

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://dugedepap.ru/strik?utm_term=stellar+ost+to+pst+converter+11+activation+key PDF link annotation
    • https://vixananuxa.weebly.com/uploads/1/3/4/8/134881407/vevezomexal.pdfIn PDF document text
    • https://tekoboxini.weebly.com/uploads/1/3/0/8/130814877/genokasabolume.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/340e22.pdfIn PDF document text
    • https://gupolapi.weebly.com/uploads/1/3/4/6/134629895/7566231.pdfIn PDF document text
    • https://nupiwezorebor.weebly.com/uploads/1/3/4/7/134715096/movode-lurujeguduzer-bupugev.pdfIn PDF document text
    • https://wifusudufasebo.weebly.com/uploads/1/3/5/9/135992472/967cb4652e.pdfIn PDF document text
    • https://rimidewazasi.weebly.com/uploads/1/3/4/3/134317879/musabilojasos_jozevusemimuzig.pdfIn PDF document text
    • https://ronenajawewaxiw.weebly.com/uploads/1/3/4/5/134594127/7a504.pdfIn PDF document text
    • https://manovofaripoluf.weebly.com/uploads/1/3/1/4/131453531/fiwirarasefe_wijadarojijom.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/1865c86c-8c4d-4d76-8b76-4e65b38bf21b/54110006661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9dabe05-4b0c-46e0-8c3d-d87df16564be/macario_juan_rulfo_personajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca707f2-e527-4da6-8958-01a4ac39efd1/fender_mustang_iii_v2_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366cf763-f157-4333-b4ef-d7952f042116/xagapofomurowebagid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee0ed73-5f21-423c-8e0b-c401bc974254/volver_al_amor_marianne_williamson_audiolibro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f93f3b3-d175-4c65-976e-eb57a04e4048/how_do_you_use_a_kindle_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f59eb17-99c5-42e8-b186-d947fa77add5/6680082513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44b935a6-fc38-4a6e-834e-5c5531285eb0/xipirarijumolevokedamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615e57cf-6004-47e6-a6f5-df77149766fe/nj_driver_licence_for_undocumented_bill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bcdef54-66cb-42b2-92f3-c57c7abc003e/king_lear_act_1_scene_4_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/730ba4b8-d5d1-48d8-b45c-231f681c3c99/parrot_ck3100_connection_diagram.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_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 5308 bytes
SHA-256: df8a544e15bfdf2dddb67452b6addb4333f743aef825966a873502808a1fc55d
font_01_sfnt_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 10332 bytes
SHA-256: 56a00b6e96540c8687e4ab659fe819dc7fec86fcb1016ab04fcb7e03c845963e