Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac7f338c6ce5600…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 11:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 063dae6dbfc2f42609702a5a51d3d606 SHA-1: 570178ad27721a4b37af0a8ca2fe230ad381ae03 SHA-256: 2ac7f338c6ce56001400230d30ab7595b9b84d047796ed9304ff912788d09998
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://inwebjor.ru/uplcv?utm_term=scanner+xray+android PDF link annotation
    • https://esterkins.de/ckfinder/userfiles/files/diramefuzewodujib.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/11049038410.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/mijaneroluxibixe.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/wofimenuwadejekefimanoram.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/28588424114.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/8255737442.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/kakoxekuluvefuvojo.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/60365194536.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/25779147790.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/dilerumurasanapi.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109152018375416.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/pomufawakuzetusak.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/40116093084.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/napanutiv.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/kisuzefujo.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/68562074346.pdfIn PDF document text
    • http://simoncaulkin.com/images/29687810023.pdfIn PDF document text
    • https://chptravel.ir/data/file/xaviwivufel.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/16407655346.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/voloremozomun.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/46101775797.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/79205820272.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/42199956131.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/xazozuboxaf.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/repadavelizadoduxevanive.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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 10340 bytes
SHA-256: 3f7b191bd1987ede9ba45a5d80368e9ee599265f75826dc63c27de649474b8a6
font_01_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 18060 bytes
SHA-256: c9601200c339bc986fa687f9bfb59f02c11f7024305c762650a3dc156c741bdf
font_02_sfnt_off000121ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1