Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa430bfdecc94de…

MALICIOUS

PDF

80.2 KB Created: 2021-02-22 12:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 027775cee12d1a0b8ddc570bf1c7de5a SHA-1: 478952a74f6c808de5323a19bc16b432b35cdd1f SHA-256: 1fa430bfdecc94def381f3f2c299c964e2a46a82b20cfa57f9ed4c6f4f306607
262 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a redirector link to 'yafferge.ru'. The document also employs social engineering by presenting a 'download button' lure, suggesting the user install a browser extension or update. This indicates an attempt to trick the user into navigating to malicious sites or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • 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://yafferge.ru/wix?keyword=cinema+hd+v2+apk+for+pc In PDF document text
    • https://cdn.sqhk.co/woleparos/dOFDcii/munusavomuzulewobazupu.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/hjIhfhc/70458367121.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/4101332.pdfIn PDF document text
    • https://cdn.sqhk.co/dojozafo/bMJhdii/lockheed_martin_missiles_and_fire_control_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/fDJgfjh/doluradoduwodakig.pdfIn PDF document text
    • https://cdn.sqhk.co/desixurate/Rhjhahg/77331961743.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lefemijip/geico_claims_contact_information.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/7943240991.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/13859766950.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/african_swine_fever_tagalog_information.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/15844097464.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 5348 bytes
SHA-256: 6f3aa5a6b57850fd2cdc82cc92501612f2e5dad6c20a86e02c63cb4e81e0606c
font_01_sfnt_off0000ed86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 4700 bytes
SHA-256: 6687c65fb36ef5ac41ece6a910ccd51b6cafb67ab5a79d2cf0434fe4f1910f34
font_02_sfnt_off0000fa19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA19 10420 bytes
SHA-256: 42f5c1ddea5a5d49efc01199d8d09393cf8a6de852f389dd5c66a6a7521aa22d
font_03_sfnt_off00011ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDF 16344 bytes
SHA-256: f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89

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