Malicious PDF — malware analysis report

Static analysis result for SHA-256 857a3a72f8de546c…

MALICIOUS

PDF

68.6 KB Created: 2021-02-23 10:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b955ff015fea300fcc079f89ce6f420d SHA-1: 20c30e556dc58bacb80ac180e07b58983c6f6b6c SHA-256: 857a3a72f8de546c0852cbb81e294c71b5e98d07997d6962797fe356e6747024
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are likely part of a link farm designed to obscure the true destination. The heuristic 'SE_INVOICE_LURE' suggests a deceptive lure related to payments or invoices. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the embedded URLs.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://druttle.ru/wb?keyword=transfer%20tivo%20lifetime%20subscription PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462732/normal_5fe7a973ead4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_5ff52874b6e1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_602269d5b6839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_600ad80f6a61e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_6025fb288b51c.pdfIn PDF document text
    • https://gokepitamewema.weebly.com/uploads/1/3/5/3/135325242/faguvisaruserem-mokufikoberore.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417306/normal_5ffd69b0656e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_601ac47c7bff4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447641/normal_5fe04be8a011c.pdfIn PDF document text
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/sebimixafosudimi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373301/normal_6002a2ef88951.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/xapiregika.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_off0000c9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 5312 bytes
SHA-256: d1e5d19bb68124c69886023d269ba9c8593b632132473bcb0523e12790dacc6d
font_01_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 12396 bytes
SHA-256: 2cdd5378e4094e6e8153119acb6022af9576e5d0c17f4bd11a74c02db2d6b3e8

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