Malicious PDF — malware analysis report

Static analysis result for SHA-256 9879da1fbd4e5c00…

MALICIOUS

PDF

80.1 KB Created: 2021-03-27 17:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b0b361546bc9d8aed8729be80d046ff SHA-1: bc951e5b5780a5a846f9e091e859c30ae8a1bb15 SHA-256: 9879da1fbd4e5c00b3efbe00da46521d706cd91185ae624b54500910ac015d8d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains a mass of external links, suggesting a link farm or phishing attempt. The primary URL, 'https://leonvi.ru/award?keyword=describe+yourself+essay+pdf', is likely part of this malicious infrastructure.

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://leonvi.ru/award?keyword=describe+yourself+essay+pdf
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/mijizikurawevakogejo.pdf
    • https://static.s123-cdn-static.com/uploads/4482645/normal_5fca4457e0fed.pdf
    • http://rerikadarax.iblogger.org/bond_indenture_covenants_balance_sheet.pdf
    • http://1xbet-football.fun/me_alone_survival_zombie_experience_nearluxps.pdf
    • http://mybatut.store/benim_hocam_corafya_2018rpsog.pdf
    • https://wofixoxabovu.weebly.com/uploads/1/3/4/5/134524794/wotugoxa.pdf
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5fd117a4e8d55.pdf
    • http://instas.site/kudesekvctu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b3149dab-0103-4b88-9515-7656855956b2/zepufidarobuvula.pdf
    • http://bitediwufekoxem.epizy.com/midigikokutoro.pdf
    • https://uploads.strikinglycdn.com/files/529a264c-2ca3-49b2-b84a-f1cebad83bee/61251438026.pdf
    • https://uploads.strikinglycdn.com/files/0f693188-5583-457c-9f39-c33090edea9a/is_snapchat_a_dating_site.pdf
    • https://uploads.strikinglycdn.com/files/d0d96442-e521-4e56-8f4c-9e8d4e8260fb/dodge_avenger_2013_oil.pdf
    • http://vefenuratowagu.rf.gd/filsafat_hedonisme.pdf
    • https://s3.amazonaws.com/nevovumowa/mystic_messenger_lolol_email_answers.pdf
    • https://uploads.strikinglycdn.com/files/6ba15410-63cc-43aa-bc5b-4417a3e265d3/focusrite_control_2.3.2_download_iso.pdf
    • http://sarirepenibe.epizy.com/baketitidofusadogumoli.pdf
    • https://s3.amazonaws.com/gopifu/fanuc_10t_programming_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb7.bin
4643a89beaa3ac570dec82d16e5447412bce6b5aff7e1750e96e32149c85d32e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 5084 bytes
font_01_sfnt_off0001010c.bin
cce9105b234954356f8d6d3a4c22ea599e42585c0213e2e4cfa43108a64d16de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 10620 bytes
font_02_sfnt_off0001253d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 4324 bytes

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