Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7e9b990f60f51a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-10 11:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5a7ed878739e6707bdb568bb3c699bd3 SHA-1: 4f627fcb5ab23540c4deca8c671d5c82258ae751 SHA-256: 9f7e9b990f60f51a76309f6c925093da1aa93d532034a644195e6a8915ab1a70
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URLs, many of which point to PDF files hosted on potentially disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade gateway scanning. The embedded JavaScript and the nature of the URLs suggest an attempt to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://urologasdainys.lt/userfiles/file/sapowepipibak.pdf In PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/vijarivapetuxikibe.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630837018.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/61012571844.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/tavoribodepidowojorok.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/gukuz.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/36639812365.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/70837004326.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/riduzelusuleferuxiludepax.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/41809038104.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/18503607462.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23951352451.pdfIn PDF document text
    • http://jljemc.com/upload/files/88068759544.pdfIn PDF document text
    • https://hirurgija.me/files/78724204518.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/sefonenawes.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109071318069973.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/pojapemugomit.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/30997168757.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/91681489844.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/56455077272.pdfIn PDF document text
    • http://orthopediedelft.eu/files/76591413922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+game+ppsspp+sniper+elite+csoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81D 20208 bytes
SHA-256: f8d108df7c846658b0d7c63f19b8b4768f2c51984c96753d2ea6937ac7ba807d
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 10944 bytes
SHA-256: 314060bc5235d9246a3b81543026c68e37107eea15aa2e45bddfaa26506787a7
font_02_sfnt_off00011541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11541 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off00012b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1