Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b2b2d2532d1862…

MALICIOUS

PDF

90.9 KB Created: 2021-02-19 12:26:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6325ac8ab3a841b143b00487c1dbdaae SHA-1: 93be0fa5f8631d56c07f80c7ffbd35079dfbae3d SHA-256: c8b2b2d2532d186269d54c7d08f426bda491cc1af3b6dcefc42173e806a6d7f9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wb?keyword=burley%20d%20lite%20single%20jogger%20kit'. ML classification and ClamAV also flagged this file as malicious. The document body appears to be obfuscated or corrupted, but the presence of embedded URLs and the redirector link strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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.
  • 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/wb?keyword=burley%20d%20lite%20single%20jogger%20kit In PDF document text
    • http://afracheat5.xyz/11109455779uiuon.pdfIn PDF document text
    • http://nuviteb.22web.org/26601001192.pdfIn PDF document text
    • http://fruitslope.online/recargar_celular_telcel_desde_usasg7sw.pdfIn PDF document text
    • http://zobebukore.22web.org/tum_ho_paas_mere_song_free.pdfIn PDF document text
    • http://naturapple.space/online_aadhar_by_aadhaar_numbernsptt.pdfIn PDF document text
    • http://edaruzal.xyz/rosemarys_baby_author8w7fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joluror.rf.gd/android_tv_from_phone.pdfIn PDF document text
    • http://vijagomifeka.rf.gd/ielts_exam_answer_sheet_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/88126188209.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/42164268080.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/92389923700.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/48253011722.pdfIn PDF document text
    • http://zepamavapero.rf.gd/cotton_and_polyester_blend_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/83250061649.pdfIn PDF document text
    • http://demunoj.epizy.com/19107474230.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/52082585931.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/8658812845.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4B 5076 bytes
SHA-256: 648e0bb2140c0077ee38abfd24a692f91392229ffec65b2e28cb249d5c0a32a3
font_01_sfnt_off00012fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAB 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00013839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 11056 bytes
SHA-256: 7684404663e1d3925b08ae282a14ea014373b4722ee7900cbc66c11dbe326091

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