Malicious PDF — malware analysis report

Static analysis result for SHA-256 99084cf642c8d809…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 02:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4d89fe4b104b77ea75d7d4331889a44 SHA-1: cd91252115225504f2a19a11d1736f14fa120a1f SHA-256: 99084cf642c8d809487e178bd27440f6bf95d5969ff95c3ca9dad8ddc2f3668f
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links to external PDFs, some of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack involving encrypted payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://krisoc.ru/uplcv?utm_term=importare+contatti+su+android PDF link annotation
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/dovebesutimaz.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/nutewiwibifiziwizinalemip.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/32497262596.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/fasotoxafu.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/38749065258.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/98837801855.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/72699368769.pdfIn PDF document text
    • http://qdcmd.com/data/files/75953009313.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/fesusebubugutezab.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/gonisodejujoveru.pdfIn macro / runtime command snippet
    • https://locktactyuma.com/userfiles/file/nobiseradobuzi.pdfIn macro / runtime command snippet
    • http://autothudo.vn/upload/fck/file/lumagi.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/65433978528.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/84978915708.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d78ae66fe---jutuxamenub.pdfIn PDF document text
    • http://potya.com/66523871693.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/ginisotu.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/17855961152.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/2297576445.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5976f077ce724db08c481fc4a26a6b99/69954822510.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/30812230027.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/70443165640.pdfIn PDF document text
    • http://stnicholasway.com/In macro / runtime command snippet
    • 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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 10680 bytes
SHA-256: bacb82e9084bbecf77478e12cef868c7b752261decf6c07ab3908f0de463bb1a
font_02_sfnt_off00010a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 17756 bytes
SHA-256: a4fae0bae288aa60fddbc1ed85bfbf6a548f89ff59cbbe49d8b800d8c5e8c7ae

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