Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff9fe23739943cb…

MALICIOUS

PDF

66.9 KB Created: 2020-11-25 05:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e35498e33b10a5d52660fb64e96bd20d SHA-1: 176f9edf70b5076ea26293a350b0ce9ac5e385cb SHA-256: 9ff9fe23739943cb4bc09bd286d0dadd6b6d844f7ea5d776b6d5f1af8001e5ad
222 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and link farming. Notably, it links to known malicious redirector infrastructure and hosts a large number of external PDF links. The presence of a 'download button' lure further suggests a malicious intent to redirect the user. While no scripts were extracted, the overall structure and embedded links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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
  • 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://ggtraff.ru/strik?utm_term=life+of+pi+schiffbruch+mit+tiger+name In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5f9b0ad206725.pdfIn PDF document text
    • https://duzufekiwavana.weebly.com/uploads/1/3/4/6/134609718/veribusumofipo_weman.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/c24c53be8c9523.pdfIn PDF document text
    • https://wutawodasigupo.weebly.com/uploads/1/3/4/5/134512212/6094b27267c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ad70d8-fa81-4b4d-8938-e1bee6d3f795/que_significa_soar_con_uniforme_de_policia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7f6af2a-f5e9-46ff-9c62-f9059ca9a41f/controle_sur_les_nombres_premiers_3eme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac470d66-9c2b-4375-988c-0485c2a47e01/orrin_porter_rockwell_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06db8de-622d-4966-9593-d77c1f0766fb/mofibonamipofomirojetaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a1924bb-5cc2-454a-a3e3-1503a9c3e376/82683967525.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/61760525731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2abf233d-7cf1-4986-b061-f2d23cf2032a/julon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72cde9b9-513d-4620-9b99-5b6c128c884d/texepukipof.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_off0000c6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BB 5480 bytes
SHA-256: 6abc68e7e556883675996e74bb7e4bb1cd8aa25abc3b5f7cc011904dd7216f6e
font_01_sfnt_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 12276 bytes
SHA-256: dc2fc47dc3e056c6355db918a7b14d8a99fd6c719801f66f0324525f50406be1

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