Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f33fd2149e48724…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 02:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2ef58e38e0d23796ba67ac31b83ed69 SHA-1: 2a6554f8df2d61f4d473f9010bf2f5218ab1adb2 SHA-256: 1f33fd2149e48724f0ae5e3c50f868766315675035bbc16e358841d9dd3430df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to potentially disposable domains, suggesting a link farm used for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zifu-tech.com/app/webroot/userfiles/files/xalegumitejuwapidor.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361f2252636---fivawi.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/47835534579.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/dalujagodag.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/gutizeziruvetozexasono.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/nulinufidazujinovitebelu.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/78166376097.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/satipakubaweka.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/94391042341.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/81457946144.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/xijewipegetunux.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/21142270180.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/10269507249.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/89812467355.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/ponawa.pdfIn PDF document text
    • http://ministerium.pt/files/fipenif.pdfIn PDF document text
    • https://plasy.com/uploads/file/30496598625.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/73334532447.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/nowepoxa.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16137578a27824---paguwupejukotaxuzudurem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=record+video+in+background+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_off0000b793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB793 16636 bytes
SHA-256: 413c568634f5d1f45e3aba0ac463b107df3cfea0e6badc70a385b4d7d78b4631
font_01_sfnt_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 10676 bytes
SHA-256: 77c81617111573abbd75cc1339ef7da7bc37f0677c4bb1293e18d60ac6464b5f
font_02_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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