Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0407cb49bd4f7e…

MALICIOUS

PDF

98.6 KB Created: 2020-12-28 09:02:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c75f23d1ddfe2025f29330fd6028bc71 SHA-1: e84ed0331896b72c2e0821a115187bd8f7c5df64 SHA-256: 5a0407cb49bd4f7ee89bd29f8f44ce101a532a440f400f3850476f0fcdf3b669
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector and part of a link farm. The embedded URLs, such as 'https://traffking.ru/strik?utm_term=100+days+my+prince+kim+seon+ho', strongly suggest a phishing or malicious redirection attempt. The presence of numerous PDF links indicates a coordinated effort to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffking.ru/strik?utm_term=100+days+my+prince+kim+seon+ho In PDF document text
    • https://cdn.sqhk.co/kinirebuseva/dgc1jgt/dodexixez.pdfIn PDF document text
    • https://xanikijopido.weebly.com/uploads/1/3/4/7/134738407/4187856.pdfIn PDF document text
    • https://lagafuxomip.weebly.com/uploads/1/3/4/3/134347440/foxunikijumuzamo.pdfIn PDF document text
    • https://cdn.sqhk.co/vexedobasof/d6wgeAu/dajexejumivisukined.pdfIn PDF document text
    • https://pajopujo.weebly.com/uploads/1/3/4/3/134305169/gadadugejidologu.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/xoferuzu/62733844970.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/99745306102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a7a777a-115f-4829-81cb-7497b155cfc0/transitive_verbs_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/448122970.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/bed_sheet_king_size_online.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/bitsat_2015_question_paper_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/music_note_symbol_text_android.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/sims_4_magic_realm_guide.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_off00010fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 7884 bytes
SHA-256: 56c0698619bacbce3f07c0bbb981640e924f1fd2f9d9c8aaa44ff30f3610b54b
font_01_sfnt_off000129b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B1 5544 bytes
SHA-256: e63e378007009ad0b807e55f4a8b60437a2093141d995b4b11d03a6f427badc6
font_02_sfnt_off00013c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6C 12896 bytes
SHA-256: 1caa729a5e2e6dec84be6f0e641893431ccd94417f32037ad7e6aa5eb0b7241e
font_03_sfnt_off000165a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A9 16120 bytes
SHA-256: 8b8fa4930c50ace3694f556761a4308dc0aac15f637c876e54ac6a63345bb900

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