Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aedc28f133ae79a…

MALICIOUS

PDF

77.3 KB Created: 2021-04-16 22:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c44cc346fd27de2eaaa4a67c14be8885 SHA-1: e62ef4023a3efe5710af701ef2fd6297e243ca73 SHA-256: 7aedc28f133ae79a13a856fb4530ed3b7712c9247ce59b6115f10be1fbef4e98
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The primary malicious URL identified is dugedepap.ru, which likely serves as a phishing or malware distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://dugedepap.ru/strik?utm_term=how+to+get+smell+out+of+top+loader+washing+machine PDF link annotation
    • https://dufemejilesola.weebly.com/uploads/1/3/1/4/131453127/wewukinotetalirowu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409403/normal_5ffb9f0c413a4.pdfIn PDF document text
    • https://sapigufebo.weebly.com/uploads/1/3/4/5/134592603/goroke-gezebipud-gajuke-dinetitedowise.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5fccdf18e4726.pdfIn PDF document text
    • https://wezawemexa.weebly.com/uploads/1/3/1/4/131410399/vebiwiv.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/whchhfT/sozusikoxirozu.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/1vYn53h/voxogubujijibozekomisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_cc778a748d7a404ab2953734c69d226a.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_e4739c76beed47daa07dd80ff2b4b45b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/101e6818-3f6f-4b98-b124-2715ec11bf61/harry_potter_libri_prima_edizione_inglese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f7231da-8469-424b-a612-086f8c0cf183/16438926349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea061344-4015-45c0-9530-8a290961840d/call_me_by_your_name_sequel_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0069ecb-6252-4efc-b540-a6e69f72e480/2003_cadillac_cts_repair_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a519f9-3df2-49cf-9474-e36d12a46b1e/32548668634.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_235936effb764ae58541fff7fdb4b4ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b37557f8-a408-467d-8925-cd13f5faf8bb/40275115011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/940791a1-857e-48a0-8c6f-92ac193de10d/88507706018.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_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 5624 bytes
SHA-256: 4a857de2a4005e24c6c35210ebaf26b197ff7fe2f100dad44a178b350e1dc9f7
font_01_sfnt_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 11164 bytes
SHA-256: f78747a417bdafc56ed91ddd71e43e0438df10638ee54b764bfb393e2a339031

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