Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e0ce25db249094f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 05:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc2e1659b90252d85d6c3c1bc85491a5 SHA-1: a8df51893fae073da5c5d800aa9d585a0aaec1b4 SHA-256: 1e0ce25db249094fdc5de2220cea4250fe3778f956209dae55c5ee99db1c5b10
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which are on disposable hosting, suggesting a link farm or phishing campaign. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=200mb+gta+san+andreas+game+for+android PDF link annotation
    • http://ranaghatpchsschool.org/userfiles/file/pixivununetaxopo.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/52862539947.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/sanafotup.pdfIn PDF document text
    • http://ativn.com/upload/file/zelikufazaruzukil.pdfIn PDF document text
    • https://membermimpi.com/contents/files/vemuwatimuwug.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb1d364c2---jesipi.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/50807368074.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/38911402485.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/xutajuba.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/kejevu.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/mavogom.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ogu4i82a2pubg3t2hl1mpl9tsv/ruroke.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/62430994364.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/19629563581.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/xiwovubowatakomidamap.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/peruzavuzamadi.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/83378487752.pdfIn PDF document text
    • https://fasaac.org/temp/files/lilukosufufedujutunifaj.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/roxemuzo.pdfIn PDF document text
    • http://knipia.com/userfiles/file/79694593048.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/87636945493.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_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 10936 bytes
SHA-256: 37920d0dbe74308dacd84917399cf509ac43a808954392948f5ad5c51455260c
font_01_sfnt_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 16996 bytes
SHA-256: e01c8d9e5e977c32134ffaa07671103d87aa402bdfde7b168f00e4ac6144e3ed

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