Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a91610ae705483d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 22:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 20fb2dafc10d7867e9002fc84034a8e7 SHA-1: 0dbf29d79019300b9a9eed794b01c156a1db9f09 SHA-256: 4a91610ae705483d73016ca8c275441c19c16c90c00cafec2471f108e7835c51
142 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and external URIs suggests an attempt to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the phishing lure, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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://infrive.ru/uplcv?utm_term=how+to+install+android+8.1+on+any+device PDF link annotation
    • http://cancercareresearch.com/userfiles/file/gigejivogevoxefuf.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/luveluv.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/tupiledidanal.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/92102123395.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/fuvebuwun.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/gasezaveb.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/22692443858.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/gevurufivi.pdfIn PDF document text
    • https://tivicom.vn/upload/files/mifudasik.pdfIn PDF document text
    • http://c-six.it/userfiles/files/13479211402.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/wadejubosisigig.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/59256975261.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/rukesezosubabusesozeseru.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/35772433038.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/71847f6a9cd51680b0ea572838682a5c/14596485677.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/58578141457.pdfIn PDF document text
    • https://2acontractor.it/images/file/potikaximigajivonawinoki.pdfIn PDF document text
    • http://cmtsport.com/pliki/wuxirewumividenujateto.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/94037697935.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/kujiwizib.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/10737590207.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_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 18228 bytes
SHA-256: 6095d19fcaca24f6a18faa73064584af499b4c1959b9888829381994d49ea9d6
font_01_sfnt_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 10948 bytes
SHA-256: eaa9161fe0dc211d883138bed77a3a0a86f723f95f56f3fd38ffa9b8f8d79f0a
font_02_sfnt_off00012665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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