Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95390054eeba8d9…

MALICIOUS

PDF

69.4 KB Created: 2021-09-10 20:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a84fc23eb960d6c8e2cea2784973594 SHA-1: 9be4e4a5ca52c2b07c39aed9548f79e11eaa69be SHA-256: c95390054eeba8d93fa82f8ade3017ec462e373637a4890edc0d9abfa3e7676e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, designed to trick users into clicking embedded links. The heuristic 'PDF_IMAGE_LURE' and the presence of numerous external URIs, many pointing to potentially disposable domains, support this. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it's designed to redirect users to malicious content or initiate a download, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389d8c99794---1438104932.pdf
    • http://fanghsin.com/uploads/files/202109020430403835.pdf
    • http://lucchetta.net/userfiles/files/90437812338.pdf
    • https://whatshoulditcostme.com/userfiles/file/gininufojotakavenoniwogan.pdf
    • http://louisamerino.com/userfiles/file/mezadalasojinumibo.pdf
    • http://wakesup.org/userfiles/file/20547866024.pdf
    • http://redondoclassicburger.com/uploads/files/xuxafosinazulakanobapote.pdf
    • http://jrpst.pl/userfiles/file/vivumogilazonisado.pdf
    • http://newmob.it/userfiles/files/badefipefuvepifivaf.pdf
    • https://sikahaiphong.com/images/news/files/ziwisupunezus.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a921206701---gikabujekuzaluzanipado.pdf
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/24862720307.pdf
    • http://riph.pl/userfiles/file/84313328507.pdf
    • http://studiocalderini.it/userfiles/files/nanilexagag.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/75251153892.pdf
    • https://reniuved.it/file/73085044584.pdf
    • http://dmkert.hu/files/file/15752119107.pdf
    • http://mabifitness.it/userfiles/files/3154605683.pdf
    • http://akvari-um.ru/userfiles/file/jilapapegatozenizebujimad.pdf
    • http://syntra.pl/userfiles/file/bekepawipenigovez.pdf
    • https://widerbet.pl/userfiles/file/zufusulerefafegiratafal.pdf
    • https://evermoral.hk/upload/file/1630897895.pdf
    • http://runhouchem.com/upload/files/30386732704.pdf
    • http://whuntex.ru/userfiles/file/58711210610.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+convert+your+video+to+mp3
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/12868366978.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_off0000b3e3.bin
a6f99d941c7f8454fddb5bbb4ebc4031f332d0b1c40e15c455510a025c657261		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E3 10828 bytes
font_01_sfnt_off0000cce3.bin
acd03f5447e1d4ccb66a7f30f50acd97a19515f8e541b1a331e001e1ed86169f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE3 14100 bytes
font_02_sfnt_off0000ef84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.