Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01affcba23c11f4…

MALICIOUS

PDF

82.5 KB Created: 2021-03-01 23:30:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ab87d431e0141023e1ec26a83c58726a SHA-1: 9a4c117fd1c0dfef2f42f5ebc82cdd8647092b28 SHA-256: e01affcba23c11f4b09743399f62328c39ff9486ac4d1413a2baf294df824194
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. One prominent external URI, 'https://jacksth.ru/wix?keyword=restorative+circle+questions+elementary', is present, which is likely intended to direct users to a malicious or deceptive website. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://jacksth.ru/wix?keyword=restorative+circle+questions+elementary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426541/normal_5ff4d736d2906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_601cbc2e88903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476011/normal_5ffba4b42f9d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_601f34c22c9c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379385/normal_5ff795aa51819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_6030fd6915391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474989/normal_5fd0da97a75d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450516/normal_5fc7d3ea33dce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405651/normal_602ab886623d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380883/normal_601f2e61a576c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_601fbba4bbd0a.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/g2Lmz0V/gujuvuradezogenawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5feedef9b8e9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5fda8531db3e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506170/normal_5feeb7ed666f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485576/normal_6005ec16958a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_5fd30d728a401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_601d237c4d76e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_600bfd5b151e6.pdfIn PDF document text
    • https://wavixozuxukoreg.weebly.com/uploads/1/3/1/3/131380445/rirojufuzomeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 5124 bytes
SHA-256: 66a53c8cfbeba6cbed774482d43b7cbd70ed84de106b4200c21ba5680d9ec3cc
font_01_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 10000 bytes
SHA-256: cdbdc5ae2a7befddcef270347c828f87a82db356e91bfd798b410fa35b1dbd25
font_02_sfnt_off00012e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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