Malicious PDF — malware analysis report

Static analysis result for SHA-256 e129e07956c79ad6…

MALICIOUS

PDF

115.2 KB Created: 2021-03-14 09:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 273b9fd31add466d90b8f4fdf037ccd2 SHA-1: d1d00deba1382048ec59082a5b7cc11cb0eb494f SHA-256: e129e07956c79ad66bfdad235374b59078497792a4bae3e78202849a024eb83c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=area+of+triangles+and+trapezoids+worksheet+pdf
    • https://static.s123-cdn-static.com/uploads/4416938/normal_60063f9ae8ffc.pdf
    • https://cdn-cms.f-static.net/uploads/4501998/normal_601ede60dfebb.pdf
    • https://static.s123-cdn-static.com/uploads/4365583/normal_5ff0acc2be264.pdf
    • https://cdn-cms.f-static.net/uploads/4450003/normal_600d43af14a92.pdf
    • https://cdn-cms.f-static.net/uploads/4418984/normal_6020508e40b10.pdf
    • https://cdn-cms.f-static.net/uploads/4454561/normal_5fd31e9e9c6e0.pdf
    • https://cdn.sqhk.co/mixubiki/klwgjih/48703288336.pdf
    • https://cdn-cms.f-static.net/uploads/4408582/normal_6041114099bfe.pdf
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5fcf7443d5bb0.pdf
    • https://static.s123-cdn-static.com/uploads/4377414/normal_6007ef6324d6e.pdf
    • https://static.s123-cdn-static.com/uploads/4374852/normal_6006fbb291101.pdf
    • https://cdn.sqhk.co/xexanodu/gifPccQ/bandai_namco_store_shipping.pdf
    • https://cdn.sqhk.co/puwipaneke/dpe5ja4/zombs_royale_io_download_android.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_d3c34c1bcc5f43538ff15fda207241f6.pdf?index=true
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_b71a10a58f5341f3a7523445e0d347dd.pdf?index=true
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_f00e3e00046b4e04acadabe1cbde2d7c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/17d764b4-a6d9-4d47-99d7-d9afd18b8f18/are_infps_emotionally_intelligent.pdf
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_bc7f1e5f6b8a4f43aa5f10411a2be6b3.pdf?index=true
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_bb94cc184ddd4e46898f2f650cf34c5a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/054c07e9-d5b8-473e-9672-98d09c6f476c/97863556358.pdf
    • https://uploads.strikinglycdn.com/files/f84e1504-759c-4cfd-a8d4-472bbe5581bf/hse_top_5_health_risks_in_construction.pdf
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_bd6ab01758374093b7ae9fb9c781c895.pdf?index=true
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_7dfbe3a4d4f24b07a1550ac8cc91dc7e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7d9100b6-45d6-4688-84d2-20b95491d6b8/dawujobenutek.pdf
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_7c0ed217791e4e3bb2d2efde79693023.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d82.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D82 2828 bytes
font_01_sfnt_off0001777c.bin
2caabbca6152d9ab05eb053a698cd87b4184328838eef4dd01866ce7c63e19a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1777C 5288 bytes
font_02_sfnt_off00018983.bin
413c1f6a10c7e3d157f67e15fbc07ffe3e74260db67433b6db4759a1fbf2f50b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18983 10580 bytes
font_03_sfnt_off0001ad9a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD9A 4324 bytes

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