Malicious PDF — malware analysis report

Static analysis result for SHA-256 0414f2515d76863e…

MALICIOUS

PDF

87.2 KB Created: 2021-09-13 19:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b84aaa2b6b2f655f8dacea95c9d31656 SHA-1: accab3dcfe720209e37be1e0b9342e86f4e78c59 SHA-256: 0414f2515d76863e49b5acd026202d30d3e61434c132db4b5ed2256ffd2ca5b0
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external URIs, indicating a potential for malicious activity. The presence of heuristics for a 'Password-protected archive handoff' and a 'Visual download / call-to-action button lure' strongly suggests a phishing or social engineering attack. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload, while the password protection aims to bypass initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://apart1day.ru/file/58618110090.pdf In PDF document text
    • http://agecarekorea.com/ckupload/files/puramejafobiseg.pdfIn PDF document text
    • https://casaalu.com/luutru/files/mujafixanune.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/54637517694.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/godokeromozigudoteturomir.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18109830180.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/41305206658.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/69769990766.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/popowopunenum.pdfIn PDF document text
    • http://rooptex.com/uploads/88521902537.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/79363644502.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/viwigemorufugaz.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/52549390211.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/26236162748.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/43158013045.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/80294653824.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/telim.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210901_230538.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/wikumupugujose.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/tizurapuxefukigusexud.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///jenodatejibav.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/55098615793.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2ec99c52---kibiteromanaxopigasaje.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/26855867713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+open+encrypted+rar+file+in+androidPDF link annotation
    • 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_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 19644 bytes
SHA-256: 0c8ad9860b22900b641d4d4c3e24af9e7093c6e8e47cadeabefe2b46c9a356c8
font_02_sfnt_off00013656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13656 10636 bytes
SHA-256: 20ed567729256613e3d3c4eda00379902e0e3958020ee794c26510402e74c046

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