Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb22d2787806ba1…

MALICIOUS

PDF

80.0 KB Created: 2021-06-07 13:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8f96c5f410e302bacaf939575b31db13 SHA-1: 0421df350ee1081b36a80e5e54c9462ca5add344 SHA-256: 2fb22d2787806ba1a213bc49bf9579a896276ed25eaaa8f7c92df43052b17a01
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a significant number pointing to disposable hosting. The primary purpose appears to be directing users to external content, potentially for phishing or SEO manipulation, rather than containing a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/pbw?utm_term=how+old+were+dinosaurs+when+they+died PDF link annotation
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/dunojojirut.pdfIn PDF document text
    • https://tijisikazodiz.weebly.com/uploads/1/3/4/6/134666015/b694a564818c80b.pdfIn PDF document text
    • https://mudobimug.weebly.com/uploads/1/3/4/8/134853100/4753632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_603e21b8d1f3f.pdfIn PDF document text
    • https://nexakolaligu.weebly.com/uploads/1/3/1/8/131871479/459315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470962/normal_602c839404ea5.pdfIn PDF document text
    • https://lobejimore.weebly.com/uploads/1/3/1/3/131383478/3354067.pdfIn PDF document text
    • https://vimuzepujox.weebly.com/uploads/1/3/4/3/134368191/d9f7acd3152418f.pdfIn PDF document text
    • https://getesedalo.weebly.com/uploads/1/3/4/6/134629657/5e8e9ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jojekepodef.pbworks.com/f/whirlpool_top_load_washing_machine_manual.pdfIn PDF document text
    • http://ronefete.pbworks.com/f/21860603455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e652c7c9-42cb-417d-b153-ac5e09eb92e0/yaesu_ft_857d_full_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/284de5d4-68f7-408d-b264-9c22b0c6cba6/clasificacion_de_los_numeros_reales_y_sus_propiedades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e7176b-c523-4cf7-a03f-1d4dbd504feb/citizenship_in_the_nation_merit_badge_prerequisites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9529f4f5-b3cf-4f5e-b05a-6d1fba1061d2/android_rom_development_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca46902-8285-4721-82be-c3666d299efb/fiddler_on_the_roof_documentary_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abe8596-5307-470b-b74d-fb9fb5b6b08e/gce_o_level_examination_2020.pdfIn PDF document text
    • http://favixose.pbworks.com/f/descargar_biblia_reina_valera_1960_gratis_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70fc90e4-1812-46fa-9869-c71a233471bc/present_simple_exercises_primary_school.pdfIn PDF document text
    • http://sagidetubi.pbworks.com/f/77885900986.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_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 5068 bytes
SHA-256: dcab171ffda341abef416b80561d0b72d6fdc81fe1913a6bee50dfd5f34f744f
font_01_sfnt_off00010a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0C 11512 bytes
SHA-256: b0ebe819434dc7461e0a7af018b442a1663ea2f3027267e9cda751a50e121dc1