Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a866c69ec93c02…

MALICIOUS

PDF

74.2 KB Created: 2021-02-17 18:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 900f49787ad8a9eb50fa743df51d114d SHA-1: 01ef0bfd89da786bc68ce1f00faaec3c33c0452d SHA-256: 04a866c69ec93c024345103b58c8daecfa863893587c659f26ab29aabd9ef558
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/aws?utm_term=when+to+write+privileged+and+confidential'. This indicates the document is designed to lure users to a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to deliver a secondary payload or conduct phishing.

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/aws?utm_term=when+to+write+privileged+and+confidential In PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/cHdoOhb/asset_management_sales_salary_hong_kong.pdfIn PDF document text
    • https://cdn.sqhk.co/lexewagoz/oVvyWia/15353051533.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/OPicGT1/19391676665.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/9lLzH01/air_hockey_table_tournament_choice.pdfIn PDF document text
    • http://prizinsta365.website/mewigafewesuwowozu9nqne.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/7Kjhgjv/mosonenijanolarufatazes.pdfIn PDF document text
    • http://firstdoctor.xyz/55079051335klsgl.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/haa2qhg/housework_synonyms_chores.pdfIn PDF document text
    • https://cdn.sqhk.co/dawafawux/ghh1Jgg/flight_pilot_simulator_3d_free_apk.pdfIn PDF document text
    • http://naturfresh.fun/3837682534hxz53.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/levovod/abc_letters_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/cadbury_alien_song.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/dadiwoju.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_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 5404 bytes
SHA-256: 149a52459d1a490246132d229dafe62c852ce383e752e82c1daa635697fb7d41
font_01_sfnt_off0000f5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AB 11200 bytes
SHA-256: f995082755df5e63dbffb992d71a41da385a4909e47be93f11460b398f628858

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