Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5742bf789d0c31…

MALICIOUS

PDF

82.5 KB Created: 2021-02-27 06:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6ebea67acd7d479016aebfe15701a6f7 SHA-1: 3a1c72966af75689db3e910d91a13e965d4a4916 SHA-256: de5742bf789d0c31418019f2b816e123ddcd91e2ab7025bf4a3a5db16cfab1a4
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a malicious redirector link and a high ML score. The embedded URL, https://yafferge.ru/award?keyword=diary+of+a+wimpy+kid+series+2020, is likely used to redirect the user to a malicious site. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/award?keyword=diary+of+a+wimpy+kid+series+2020 In PDF document text
    • https://cdn.sqhk.co/rubuxupab/jcjeghu/catfish_rigs_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/PjaijW3/mp3_player_bluetooth_adapter.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/WQhb88g/11103829378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428083/normal_5feb18b2a32bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527108/normal_5fc7fcbebaf52.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/ho4hiOr/32617842707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_60287b5e70c10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463809/normal_5ff26743158b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455657/normal_6013267866f42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501965/normal_5fe10de1b99c3.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/zobuwubedak/19615319428.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/blank_skeleton_diagram_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/how_do_teachers_afford_to_live_in_san_francisco.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/allshare_app_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/25331500722.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 5688 bytes
SHA-256: 6b91462a94a08c25b552fd96bf254cde31830a7dff17535f86b18f29d8931dac
font_01_sfnt_off00011755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11755 11060 bytes
SHA-256: 1d10831e1c79129d18095a1eed726c0de6435b59de3234b9946f1eed0be9139a

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