Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdc58e0ccbcc6e0…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 06:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6bb88673cfffaed54b839c936f67a0f7 SHA-1: 28de563d7b71ddf5a4c37dd382f852d6f4dfdd5e SHA-256: 3cdc58e0ccbcc6e0b60331064d22f5a6644258c478b7f96ab50f1eb9b822cc4a
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=bluetooth+hacker+software+for+android PDF link annotation
    • http://pazarziraat.com/userfiles/file/nugaxonebopafade.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/12754880562.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/xilawojorewadarotolanave.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/55294858094.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zixuni.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/sajav.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/xugonulomewutozexi.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/58301151373.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3ca584666---warutudigevepujigafafibaf.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/50461669704.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/gikozubedubunub.pdfIn PDF document text
    • http://fitviewer.biz/files/file/futamebaz.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/99044175749.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/pukunowepubabiguwizon.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72982221285.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141183b4600a---dinofijuwuvoro.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/vinisesajovefeb.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/9421338725.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/81429946576.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/papusidogopusulemar.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210909/16311341149491.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_off0000ae22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC634 17712 bytes
SHA-256: cf08339da3a51423102f1e80cf36a7d9d03dddfd4dbd0b479cb7bc9693a87adb
font_02_sfnt_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 10904 bytes
SHA-256: d3ca4702ce9ecb6f446f757e7c573433cf4f443cb41f88509af153c49608ddac

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