Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cf934f28f0407a…

MALICIOUS

PDF

76.9 KB Created: 2021-06-11 02:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 40c339f101f45144c7966d2205788401 SHA-1: 0a46b036b20301c129c6f98217d78f147cab14b2 SHA-256: 17cf934f28f0407a26a66cbf881ef20295d633d8a24da645c009e14a575471de
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Minecraft free trial pc'. The presence of external URIs and a link farm indicates the likely intent is to redirect users to malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://cructi.ru/pbw?utm_term=minecraft+free+trial+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420245/normal_6009e6ec3f7f0.pdfIn PDF document text
    • https://pudixibavumop.weebly.com/uploads/1/3/5/9/135964902/pupekaveko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_602c41d6c2e68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5fe7f77189d6c.pdfIn PDF document text
    • https://jitugexe.weebly.com/uploads/1/3/0/9/130969989/c640268ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_602aa6149ee9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408858/normal_5ff2aa5973315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_604b291ee4751.pdfIn PDF document text
    • https://zelivetatop.weebly.com/uploads/1/3/0/8/130814581/d5cb91d6a16d3a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481154/normal_5ff65ec0c8a20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401545/normal_5fdd61967a7db.pdfIn PDF document text
    • https://xidasosi.weebly.com/uploads/1/3/4/7/134722002/6226773.pdfIn PDF document text
    • https://jurutidi.weebly.com/uploads/1/3/5/3/135397820/zimobifavonebuma.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/e66aff16-87a1-41ce-bf16-8cf50008aa28/vtech_cs6114_dect_6.0_cordless_phone_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97f8f5cd-2885-4494-bfac-1d241023c9e0/kejosododoleganugatubava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f09b3a4-e8ab-4857-a933-e95ef2f01c38/el_dador_de_recuerdos_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92446e26-6779-411c-ba19-5328ea30b781/cuanto_cuesta_el_baloto_en_colombia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f61fa3df-90e1-4835-a4f8-10a6c29200c3/mod_shop_dallas_tx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741fe58b-6029-4069-9b79-1da26e915bc6/what_is_a_steak_day_on_hcg_phase_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb6d69c-f6da-4f53-8c09-c0dae7973a14/21892312828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fae019f-7fbb-4b7d-a9d8-daa61700ab70/zububal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c60683e3-0b4f-4f4a-a66f-7d67877cf437/golds_gym_exercise_bike_battery.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_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 4836 bytes
SHA-256: d707c3e370d985454c668b24adbba4eecf8d302824f74790c86e4a8912c81c38
font_01_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 10728 bytes
SHA-256: 6cc2b1a383c0dd7cc4aec37a9f8ec8e8af3494a8c87c2f03987a9505b3de1ca8