Malicious PDF — malware analysis report

Static analysis result for SHA-256 f790f7a3b7129048…

MALICIOUS

PDF

75.9 KB Created: 2021-09-25 01:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1820f2e86532e356e35e19e1977cb5c1 SHA-1: c116c98ca75d27f4a43c4f2a4c39268abe8b98f8 SHA-256: f790f7a3b712904810fc167f0aab368c7531361c6069b7c2d384417ae8da0dc7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to download and execute further malicious content. The presence of numerous external URLs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The PDF structure and embedded content indicate it's likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=mp3+trimmer+apk
    • https://ww150004.linebot.net/upfile/files/20210903134500.pdf
    • https://nhatthiengroup.com/files/uploaded/files/moratajawalapapakimarul.pdf
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/benikowuwitexemon.pdf
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/82406300738.pdf
    • http://sonarkella.com/userfiles/file/67328210841.pdf
    • https://sassanoproperties.com/FCKeditor/file/tuzola.pdf
    • http://byty-pardubice.eu/UserFiles/File/67065442130.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161472ec5ea3c2---21783907043.pdf
    • https://threadworx.com/thread/admin/uploads/file/70029692803.pdf
    • https://redac.ch/upload/gelajunimerapizogiduper.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/696dd75b8473c81a28b7c48ed1f58a21/vereta.pdf
    • https://zooiguana.pl/app/webroot/media/files/39457603051.pdf
    • http://swissies.lt/ckfinder/userfiles/files/22070963310.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/najun.pdf
    • http://hieuchuan.com/upload/files/nituxagagikusexagipejiw.pdf
    • http://nguoigiupviec99.com/webroot/img/files/wojilavurapexomaleto.pdf
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/jelevikixawusipemebizikip.pdf
    • http://artdealer.vn/upload/fckimagesfile/f777332db2c94ce8618d6c0d3089d552.pdf
    • http://studioesflores.pl/obrazy/file/vovewepowavifeje.pdf
    • http://christopherdallo.com/file/83605519130.pdf
    • http://automsystem.com/UploadFile/file/20210910233504328.pdf
    • https://weborder.cloud/userfiles/file///54671641752.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_off0000be5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5E 16792 bytes
font_01_sfnt_off0000d675.bin
47c85ebaa4b1700ebfd6c9c86063190db0af543961f2fb633a94362d3021601a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 10232 bytes
font_02_sfnt_off0000ed7d.bin
8c098c3dab66ec672d9a3c9ba36a2f224ce1d5f9d5e344cf412c2002b1e994ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 20176 bytes

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