Malicious PDF — malware analysis report

Static analysis result for SHA-256 a320a0a2f35ff72a…

MALICIOUS

PDF

81.5 KB Created: 2021-01-10 13:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 850af6be5fe1752e5fecbcbb29eae2b0 SHA-1: df832458a7b9f617aeef6df5d2905f0c7aabd9ce SHA-256: a320a0a2f35ff72ae073d14649d529653b9b16ab415bdc944f735d6ed6c9242d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards the use of JavaScript for malicious redirection or exploitation.

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://trafficel.ru/123?utm_term=ffxiv+unspoiled+nodes+not+appearing PDF link annotation
    • https://raponomipa.weebly.com/uploads/1/3/2/6/132681826/a6bec0cda6e0f60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5f8c66fb5ccf0.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/buvukujixasinaloke.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotonolo/zjaodz9/pedok.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/pompa_sodio_potassio.pdfIn PDF document text
    • https://movulejovem.weebly.com/uploads/1/3/4/4/134470355/goviwugojebexamiliwo.pdfIn PDF document text
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/a99c5.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/xilojililub_wiwowalinog_ripusugawisif.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/9jehdif/xawemudejanojokubipen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_5f9f87cb94204.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/tuzamada/apstolos_augustus_nicodemus.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/76839758453.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/pdf_file_to_wordpad.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/tavesiwisonulonitasawove.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/aleph_borges_romana.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 3276 bytes
SHA-256: 7f0857eec75886d725c9d9f1c50998fd6f0a173d01fbbe7ceb664d571a90b319
font_01_sfnt_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 5292 bytes
SHA-256: d164906a3650c4e248eab67b0fd8f7f98d314b56d3011c6345f1a0e624390d87
font_02_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 12576 bytes
SHA-256: 4850e173770d1199a8b97c871e7229a81cae13506acd67d5aab27a004eeea1d4

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