Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d547de79fc7db2…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 10:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96b654744a97d434f56f8af91016d92b SHA-1: b0d1282f2ce68dcdf81bc0b6a1b3cf878508039a SHA-256: 18d547de79fc7db2c8ac3cb4270fe7014ad2ed46eb4516182c3aa59ac88524c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs and a heuristic firing for a 'download button' lure, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm indicates an effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=android+auto+switch+wifi PDF link annotation
    • http://kezmosas.hu/files/file/bojerapam.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/rikije.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/sumagafaverosegefibelil.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613368a794046---wopitarifotejon.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/sosuvifoki.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/84769037521.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/goe65176eior69pqo907mou2si/zesesewitigixumof.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/10832536892.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210905/file/furekusejuza.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/39968279575.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/30495309914.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/wosumetisonu.pdfIn PDF document text
    • https://12shio1.com/contents/files/42481359420.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/fijulixixomefat.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/turofi.pdfIn PDF document text
    • http://generoussecurity.com/uploads/vitabijuke.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/68794643578.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/joles.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/favonijev.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/88685349540.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/zegiwogelajurex.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/dejuwibujek.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/55318530811.pdfIn PDF document text
    • 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_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 10564 bytes
SHA-256: 66b4b68e862c7ee0677dc5af421ba70bfbeb1c4034f78801118777faae150471
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 18432 bytes
SHA-256: 2048130961b46de3572f779812255268be2ece0e6e2afb90a6af193c79d6f9f7

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