Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5e0b857eed00e0…

MALICIOUS

PDF

68.0 KB Created: 2020-12-24 19:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 17fa9de4b615ad0f6f7d553c461053ab SHA-1: 8b1aeab12c5a8016a87d818a7edb34628b655e3c SHA-256: ce5e0b857eed00e0112758d2a88e2bb63672c949b49496e03f6dfe2be68f2fc2
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, suggesting a link farm or redirection mechanism. The presence of a 'download button' lure further supports a phishing or malicious download attempt. No scripts were extracted, but the PDF structure and external links are indicative of a malicious workflow.

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
  • 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://trafffi.ru/aws?utm_term=lamberghini+song++320+kbps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4498994/normal_5fc37814b02bf.pdfIn PDF document text
    • https://cdn.sqhk.co/nibedogoxov/Ajbiihh/degekitese.pdfIn PDF document text
    • https://poxaneduwi.weebly.com/uploads/1/3/4/2/134234601/wojubu.pdfIn PDF document text
    • https://cdn.sqhk.co/mebinolopuf/uhgghnc/sandbox_pixel_coloring_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5f8f48ceb2dea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_5f90cf8101adc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5fcc8fe16186b.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/27ffead4-efa4-48bd-a482-fef2f0d1bec5/vujibafirotigoxinosimune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7982a51-0dc0-4f99-ac32-fae8cbe28e1f/mimsy_were_the_borogoves_lewis_padgett.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de849b5d-71b9-458a-8781-9b7ead33ff99/viking_bay_resort_big_cormorant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9ac7c6-b44e-4d1a-9da8-0c9430705c00/lodogamumasenavelujipego.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/58573365317.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_off0000c990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC990 5784 bytes
SHA-256: 16fe9b00be1da6df7c3203828c6fb782c8032329749b369766cd40afeb96d650
font_01_sfnt_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 10860 bytes
SHA-256: 0f2ff37483a68bd65ea936d0343a0634bb215b647041d5f65f014777eb15ff6f

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