Malicious PDF — malware analysis report

Static analysis result for SHA-256 9055df0fa1481213…

MALICIOUS

PDF

65.4 KB Created: 2020-12-01 13:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a38e61beaf52be5cc7e94621dd72955f SHA-1: 7b9c65fe7e45ecf98407cc07ba090642c4eb39e3 SHA-256: 9055df0fa1481213207d8f2346936c87475670a5febf50a061e493711249f9b8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/aws?utm_term=workout+tracking+spreadsheet+excel PDF link annotation
    • https://namukizup.weebly.com/uploads/1/3/4/7/134748015/jiguxiloxezufemoxed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5fa5c58673c02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451025/normal_5fa96b6d90813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448542/normal_5f9f659717505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8ac92bcc6c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_5faddc398e762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424025/normal_5f9ac7f702abe.pdfIn PDF document text
    • https://fixabugodorev.weebly.com/uploads/1/3/1/8/131856934/lifufigatemo_rikiw_lazunogiw_leraxula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f98db4e11919.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/30db2b9a-ffd3-43aa-ba96-9a44a833cfa2/21886285066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f36ab19-f3fb-4794-aff5-8bb9981a1d65/3_point_saddle_bend_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64fd0af-18ba-4339-b897-3c156801c6a6/2736703141.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_off0000c4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CB 5480 bytes
SHA-256: 04a8b00448fcd28d3f58bab8510f06d84792ca2f143dc6a0134d2e2fa054ada1
font_01_sfnt_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 9876 bytes
SHA-256: 3a17d3e55b71d3d7de7112b4623e59cde9d8b65cb93368f744f22336b85c5942

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