Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31ab3e1a3c48d22…

MALICIOUS

PDF

79.4 KB Created: 2020-12-31 17:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7d9a8e6659dcf9be5d883baf72812bcb SHA-1: 7693c112e12b44ecf8d6a84b387b04d873c8ebfb SHA-256: e31ab3e1a3c48d22339cf966302c242882e49fbdc2cc619666b12f4274649e50
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting it functions as a link farm to direct users to potentially harmful websites. The presence of embedded URLs and the PDF structure strongly suggest it is used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=social+beings+core+motives+in+social+psychology+3rd+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490523/normal_5fed79a030148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466391/normal_5fd7345386a17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_5fb6b26e9d528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_5fd7f7ffe0949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_5fd12310a4535.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464995/normal_5fced0dedc978.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380393/normal_5fdf6844aebcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450504/normal_5fc350c989210.pdfIn PDF document text
    • https://tidoxanarapora.weebly.com/uploads/1/3/2/7/132710787/330997.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/42dbf14e-3d7a-4852-a0ea-794af5a7b78c/sovevuxupudatunaxadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6961363-bbc6-4250-90f3-b7db69412b9c/fudisolof.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E0 6136 bytes
SHA-256: 3d8f6de9937d6b090a52c3e9c0b0eb0e02b1282de99eb0ce252c0b5ad96e566f
font_01_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 11012 bytes
SHA-256: ff3a141567aef8b9245d68a92487e5d1d542d47df5582f3d8ac5b5c6279096a4
font_02_sfnt_off00011adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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