Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6589a434117540…

MALICIOUS

PDF

71.5 KB Created: 2021-09-18 03:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8429b679336f6e9fbd8002d477067396 SHA-1: 13154d493e13df7ec86787c325c65e402da3bb9e SHA-256: 9e6589a4341175407e1f95fce9e0186147379398279470f70cb3945b24149d98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or to distribute further malware. The presence of external URI redirects and link farm characteristics suggests a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=cordova+to+apk
    • https://feldmann.pl/userfiles/file/75565977637.pdf
    • http://print-resource.co.uk/ckfinder/userfiles/files/99504010158.pdf
    • https://quangcaomattroi.com/uploads/news_file/xivawazisuvuk.pdf
    • http://ff-engineering.com/userfiles/files/34647073557.pdf
    • http://pp-aqua.com/userfiles/files/tigonedidezasiw.pdf
    • http://miass.realxenon.ru/uploads/files/40552528356.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd248c5240---fatofadegumega.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/meratuxubif.pdf
    • http://one9five.com/userfiles/files/wujofinetakeragobun.pdf
    • http://www.pattyn360.com/upload/forum/files/xibamuraluzorejutosu.pdf
    • http://1day2night.com/UserFiles/file/45644550484.pdf
    • http://les-dvorik.ru/userfiles/file/womunabojukop.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/81341621579.pdf
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/61831724564.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/akj3h4rd4tqpr9qh8trjf3usl0/24078539995.pdf
    • http://harekatmemuru.com/images/Media/files/lutisopivarajekojo.pdf
    • http://longvu.vn/Images_upload/files/piwilixidovilole.pdf
    • http://psn-monolit.ru/img_file/files/vitiwibigolid.pdf
    • https://er-cardiff.com/eurostyl/photos/file/36784121694.pdf
    • http://scsychem.com/upload/files/81926016217.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_off0000b6cc.bin
3c85feb8ad96344b01d2eaf056dc23650966531ae6c2d49fd78d3d31b5631143		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CC 16892 bytes
font_01_sfnt_off0000e296.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 16792 bytes
font_02_sfnt_off0000faad.bin
b33ace30453cc89bec53b449a1f3ee0d62081118d8c088230b32476cd02394c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 10032 bytes

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