Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c87a4e64e4c831…

MALICIOUS

PDF

72.9 KB Created: 2021-09-12 01:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a7524267d70335ee7b1995350d5f5d3 SHA-1: 68f0d80719c8ad9519d624ed45d6f272b9db623f SHA-256: 16c87a4e64e4c831c7814ecb0b1597cbb57fda4c5ac2c61343c5ce620d29060c
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ML classifiers and ClamAV, and exhibits critical heuristics for a recovery secret lure. It contains embedded JavaScript and numerous external URLs, suggesting it's designed to trick users into revealing sensitive information. The document body, though heavily obfuscated, likely contains the phishing content, and the embedded JavaScript may be used to facilitate the exfiltration or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://catamma.ru/uplcv?utm_term=v3+mobile+for+android
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/64487594687.pdf
    • http://alfadent-volg.ru/images_uploads/files/fikatixam.pdf
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/varojigun.pdf
    • http://pcwenhua.com/uploadimg/file/16306510021401071252.pdf
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/bamojijiviwuf.pdf
    • https://durgabas.coop.np/ckfinder/userfiles/files/xesudupux.pdf
    • http://packamate.com/userfiles/pezuvolarosunisarufobesu.pdf
    • http://schokoladenbrunnen.de/idata/zasupubobekolabu.pdf
    • http://andreaslasnik.com/data/files/37703155918.pdf
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/85172336390.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a8c2cb61---kijelemovinizeveroje.pdf
    • http://geomanteia.com/userfiles/files/27192326950.pdf
    • http://stihoplet.by/upload/editor/files/sukijupuwizawixa.pdf
    • https://nacituran.com/userfiles/file/75488771630.pdf
    • https://cargoservice.pl/cargoservice/userfiles/file/85847837556.pdf
    • https://hagabb.ro/ckfinder/userfiles/files/bofofimiwela.pdf
    • https://uetty.xyz/js/ckfinder/userfiles/files/maneno.pdf
    • http://tongchangkj.com/uploadfile/file///2021090907060051.pdf
    • https://vientangluc.com/upload/files/panelobam.pdf
    • https://breedlife.com/upload/files/40761157419.pdf
    • http://locke-3c.tw/uploads/files/202109051000316540.pdf
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210912060514.pdf
    • http://studiorinaldibedin.eu/userfiles/files/rarejudivesev.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/7d8145d9d29c4d64b6d1a1471810cdcc/bikivoj.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9f8.bin
8c2dad3ee562087be313302d4252d19614736c884cf46ed86de0906322e0a46e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F8 10528 bytes
font_01_sfnt_off0000d1d9.bin
e7871c7b82ee09fb9c112e3e56bedd3778f2e1c06481aec950cceac54c3f5de1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D9 17208 bytes
font_02_sfnt_off0000fe77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 16792 bytes

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