Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5fd635578acd2d…

MALICIOUS

PDF

73.7 KB Created: 2021-09-25 20:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59e86d65505cd53bd86a44015696e8f0 SHA-1: a0f2f99686a39a486603e0f8cccfbc054813793e SHA-256: ea5fd635578acd2d4f66ffef6d278fa4ca9402fdc222d9b93c5b707da57783ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, but the PDF structure and embedded links are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=phineas+e+ferb+assistir+online+hd PDF link annotation
    • http://abnig.friendship-match.com/upload/files/tuwofubemejujutes.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/sebupopurokopoval.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/jemoxemudiwikasokoxev.pdfIn PDF document text
    • http://farashimirooz.com/files/veziwelirelafuriba.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/xosasapozifefojitivozow.pdfIn PDF document text
    • http://tulga.ru/editor/files/89526178433.pdfIn PDF document text
    • https://togeltop.net/contents/files/45622698424.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/28069267469.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/82519335962.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/wujuberupu.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/vekagokivipozekutixiriv.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/505d4348caea6e2e6ce849d66f8b0434/40372321525.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/zenejopopomodomexunof.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/85156642834.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e63462b887b999922063973a880f28b0/64130984147.pdfIn PDF document text
    • https://saya.ro/app/webroot/files/userfiles/files/ferutovewutojikapolasom.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/38024384010.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210915_163443.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/mivozevapegakikar.pdfIn PDF document text
    • http://dd-eng.com/files/files/93718495672.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/xaluf.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/vipafusutudenev.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/xarefizano.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D7 18352 bytes
SHA-256: 871dad4d9dc04f4a0c546e9169ecb021c831e87311297ed37ba585ff072daf62
font_01_sfnt_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 10592 bytes
SHA-256: 6bbbe37082e87200071924c7ce8af6de6932c96e458d0cf3cc9d89605e7b9d18

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