Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace280db78feb9fe…

MALICIOUS

PDF

81.6 KB Created: 2021-02-25 02:14:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 462c094d0ab08e34fd356ddda6be3a28 SHA-1: 6382db7ec02166ab2e3839a074b94e8cebbe86c4 SHA-256: ace280db78feb9fef02e3be2cd324918c5d648a872919a96406cc541bf10523c
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://yafferge.ru/strik?utm_term=metaphor+games+for+3rd+grade`. This, combined with ClamAV detection and an ML classifier flagging it as malicious, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to PDF creation and a URL, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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/strik?utm_term=metaphor+games+for+3rd+grade In PDF document text
    • http://gonzo-3d.com/tablas_de_excel_para_descargar2ui95.pdfIn PDF document text
    • https://cdn.sqhk.co/xisalaximel/hTlheOo/wizodapebixuvug.pdfIn PDF document text
    • http://megantv.site/panasonic_plasma_tv_42_inch_specs20ytl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482849/normal_60009bf229e24.pdfIn PDF document text
    • http://mxbur.fun/guvusemaxigofasowufijuec3cv.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/4XJYyjb/tikotitoxom.pdfIn PDF document text
    • http://teleporttur.ru/51763778401fw07l.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/0vZjf2Q/bovokejozetoxonanigoluko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_60053fad48212.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/nHijie5/snapping_turtle_eating.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/Whr1oie/thimbleweed_park_hotel_walkthrough_casual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fffe8c33b1d2.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/iCzrgg4/serumojevaka.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/URgjdhj/crafting_island_survival_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jakatote/pvOhbBV/archers_battle_brothers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 5228 bytes
SHA-256: 310a8b278f8e433a4914ded8303e2e6b87827f7f6f805c86592e8d89aa03ffb1
font_01_sfnt_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 10464 bytes
SHA-256: 16be0bc5986a220fc2bb26dfc4da4201ac53f42d26c1a30326ef56f4b050bad2
font_02_sfnt_off00012b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B09 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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