Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0938dca3c954a5…

MALICIOUS

PDF

78.1 KB Created: 2021-03-16 14:00:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c4046836da9143640179771db4ce8c0 SHA-1: ee21630a6045ee1bb477d9444a6d88c8f0dd8b69 SHA-256: 5e0938dca3c954a5796069201f498b880918ecc00e41986197f909e6fd31eaab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=math+algebra+worksheets+pdf
    • http://nosumiva.mywebcommunity.org/jurnal_jamur_rhizopus_oryzae.pdf
    • http://infokurs.design/best_new_games_2019_androidf7qy3.pdf
    • http://websporizle4.com/how_to_find_your_amc_8_scoresdhjd.pdf
    • https://cdn-cms.f-static.net/uploads/4416494/normal_6035e89f6808c.pdf
    • http://xofelivigavas.mywebcommunity.org/aws_solutions_architect_exam_dumps.pdf
    • https://cdn-cms.f-static.net/uploads/4453338/normal_602e9bf3879d4.pdf
    • http://fastpeysistem.online/94008820368monvd.pdf
    • http://amorexpo.com/65221777795afvnn.pdf
    • http://streichpack.online/28324323646kxy11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1beb78f4-22e8-4928-a7f3-b55bc78c3282/schwinn_airdyne_ad4_year_made.pdf
    • https://uploads.strikinglycdn.com/files/003fc3a6-6faf-4c0c-b2ee-e10301765394/integrated_chinese_level_1_part_1_lesson_4_workbook_answer_key.pdf
    • http://fobiwuna.epizy.com/86258243572.pdf
    • https://uploads.strikinglycdn.com/files/c263a3ed-5dcf-4d4c-bd9b-73615fd174d2/dunkin_iced_coffee_calories_small.pdf
    • https://uploads.strikinglycdn.com/files/59348775-01b2-4b7e-84af-5bb3e7ada623/tamiya_king_blackfoot_parts.pdf
    • http://xonisuxumezitez.epizy.com/56653549130.pdf
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_1b668f9d9371417aa5a85f623b3e1d2f.pdf?index=true
    • http://gubadix.epizy.com/drug_resistance_malaria.pdf
    • https://uploads.strikinglycdn.com/files/6d86c4de-e5d3-40a1-9eb9-c4f8bcc70fa5/mudapetajipugoliv.pdf
    • https://ed457e25-7262-4bf7-b769-9a3df1da8a49.filesusr.com/ugd/60ac0c_96352243ee9a468cb322b929ba7d3f7f.pdf?index=true
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_22d7abe3cb7e411daf692cd1805199b9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73a.bin
dea38560e0e61bc4e4efae6bc14f7dfb05eb45f9837f0e48f9668c997742a061		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 5240 bytes
font_01_sfnt_off0000f931.bin
8a238d1645eaa9cb1bde1217d6c3999edfd302efa5db3ee49a1852145eae9bdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 10640 bytes
font_02_sfnt_off00011d54.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 4324 bytes

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