Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f00d80e640c787f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 21:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c627f6ba6e8aa244a40ec6bf8c086f6d SHA-1: 8d53dba3a3d7dc1f995c1aff85bd869462277213 SHA-256: 5f00d80e640c787f7ba0fe161f0e8764fc487a1184492542eda7a39da72e28d6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some pointing to raw IP addresses, which is indicative of malicious activity. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document is designed to trick users into downloading a password-protected archive, a common tactic to bypass security filters. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://gancza.pl/userfiles/file/91249331925.pdf In PDF document text
    • https://kakakmanis.com/contents/files/setev.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/likurupekifiwabu.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/fisakok.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210906202205.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/35272847795.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/demivenosukozox.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nedewetuju.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/53864682177.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/duvakiwavirilat.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-5/20210905170501985996.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/petusa.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210909_055655.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/fidodinujibusabe.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613706d3486c5---torozaviben.pdfPDF link annotation
    • http://snsi.jp/image/news_file/laxugasitan.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/xugagekikiwopivufe.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f998892500---90623557933.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/21821808300.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/30808053488.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/87532596931.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/deladasetesaxenasudujo.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/fifibokawuwavonajifuriv.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/zomun.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161382709584a1---xusajepowomeragub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+remove+my+pattern+lock+screenPDF 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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 18600 bytes
SHA-256: 6e5d89010fb003a9f1185ff8fb5759883ed0d2d7a27e10d34fb9f65ac2718e22
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 10792 bytes
SHA-256: 1dd1c5e9cd0ccdfddac0415b1565776ddcaadef7bfe10f93dcef21cf68141411

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