Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea449d75009cb23b…

MALICIOUS

PDF

72.0 KB Created: 2021-02-27 06:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ca6a68eb62ad628311459edf50400627 SHA-1: 6a22e90385ee5b8b73e6bf8c21d3cd4c22d217ae SHA-256: ea449d75009cb23b922f9c73077de7ec6778200729cfc26e28a9586deea2b2c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, suggesting a link farm or a distribution point for further malicious content. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading potentially harmful files.

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.
  • 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
  • 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://xajibur.ru/strik?utm_term=after+we+fell+book+pdf+google+drive PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449392/normal_602ab62daaf48.pdfIn PDF document text
    • http://megatorg.ru/khalnayak_mp4_movie_free_download3d5l4.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/ravotisepozwj4w1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451544/normal_6008c155a6a80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_601848e06d268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408330/normal_5fe2c57a97368.pdfIn PDF document text
    • http://creamwalls.space/puromixozunobldauq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471690/normal_5fc8c57dd4cbe.pdfIn PDF document text
    • https://wimaxexuxiwob.weebly.com/uploads/1/3/0/8/130874544/wogus.pdfIn PDF document text
    • http://prizinsta24.online/how_to_write_a_pitch_email_exampleksbi4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367674/normal_5feb5f3199ba0.pdfIn PDF document text
    • https://rinavufapakoto.weebly.com/uploads/1/3/4/4/134460237/558933034bf4c.pdfIn PDF document text
    • http://politach.com/jofowekavota8u2.pdfIn PDF document text
    • http://linza.media/36052174505la8y2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_602dff777a06b.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/tiwozotufe0i0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 5168 bytes
SHA-256: 9f55e7ec3cebffcd36aac6d00cd69bd38ea9ec2ec4e95c1ecb3fcc9691235577
font_01_sfnt_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 10092 bytes
SHA-256: 4daf210e093471de4d681e49ec8d2a3ade78f2089fb4e9e326a88fd1486cb890

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