Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dcd09eeb18a3a0…

MALICIOUS

PDF

79.0 KB Created: 2021-03-06 12:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b722d6f710d560328f395339047629cd SHA-1: 7c795152eaa718735a6056ee41275c7f717bb90b SHA-256: c5dcd09eeb18a3a0056247c61122eaca0f7a979611a936a076ee6ca14523ed09
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an external URI pointing to 'midufefew.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a book title, aiming to trick users into downloading the malicious PDF. No scripts were extracted, but the presence of external URLs and the overall detection profile strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 4

  • 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://midufefew.ru/123?utm_term=el+retorno+de+los+brujos+libro+pdf
    • https://cdn.sqhk.co/perikowep/hbifXja/note_taking_apps_for_ipad.pdf
    • https://static.s123-cdn-static.com/uploads/4425515/normal_5fe01c78b9c41.pdf
    • https://cdn-cms.f-static.net/uploads/4366341/normal_6032e2aa59d32.pdf
    • https://ledimame.weebly.com/uploads/1/3/5/3/135306483/juxorijawigor_gavazugul_vesani_jaluzapu.pdf
    • https://xafokakiza.weebly.com/uploads/1/3/2/7/132710638/1ca559621.pdf
    • https://cdn.sqhk.co/fowijuseziju/c6gfqPZ/carrie_underwood_songs_2020.pdf
    • http://runatem.66ghz.com/xoselurolezavoxaturiter.pdf
    • https://cdn-cms.f-static.net/uploads/4425235/normal_6041ffaf21051.pdf
    • http://lulopoboxefon.scienceontheweb.net/mewagaduvelikar.pdf
    • https://static.s123-cdn-static.com/uploads/4417643/normal_5feb24cd79f9b.pdf
    • https://cdn.sqhk.co/soxuvezosapa/tQjg4gd/82379679002.pdf
    • https://cdn.sqhk.co/woxemumi/V3xifA2/crossfire_trail_quotes.pdf
    • https://cdn.sqhk.co/natefisaka/ibodmgg/crash_team_racing_pc_free_download.pdf
    • http://lanafobigowo.22web.org/beats_pro_earbuds_colors.pdf
    • https://cdn-cms.f-static.net/uploads/4464734/normal_602270f5f0919.pdf
    • http://tidirakozodawon.getenjoyment.net/hard_crossfit_workouts_with_weights.pdf
    • http://foruzakitotilut.iblogger.org/87680060461.pdf
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/dolafigiburukujazak.pdf
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/rifazenaxunokida.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c9a14ce5-3e2e-4341-81f3-ad42243f8eb6/napegagavusowegitovilemo.pdf
    • https://uploads.strikinglycdn.com/files/69258f06-b25a-48de-93f6-eb6326453335/bible_niv_large_print.pdf
    • https://uploads.strikinglycdn.com/files/7c1ee055-8959-4a74-9f2e-c378d4194fcb/formato_informe_de_avaluo_comercial.pdf
    • http://kugukokoner.myartsonline.com/tuwobupawosivudene.pdf
    • http://dafizetegepiri.rf.gd/zenoliwomo.pdf
    • https://uploads.strikinglycdn.com/files/5fbd8c5b-9460-47d9-a423-fbbfe7256569/74202960358.pdf
    • http://komadolosa.rf.gd/klaus_mikaelson_quotes_to_caroline.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f543.bin
0b9fddaf7c7601852385231515a7ed39503592900a89f635d7094e8e0a586855		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 5000 bytes
font_01_sfnt_off00010652.bin
3f736f26aaaf6341f096f1fb0fce08cd5ebfff4f077e886a405c13a150723d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 11804 bytes

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