Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4722599f6cd7f4…

MALICIOUS

PDF

65.4 KB Created: 2020-11-19 07:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c0248623c9d7cd381ea849439f664cf2 SHA-1: c364ca3d3d99ac959c8cf2a041ef7e018cf3ca11 SHA-256: dd4722599f6cd7f4f503b177a87d4093588cd7e15d99e051f2dc739f76640a17
156 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for a "SEO Link Farm" which indicates a large number of external PDF links. The primary URL, https://trafficel.ru/123?utm_term=day+and+night+worksheet+pdf, is likely part of a phishing or spam campaign to drive traffic to other malicious documents. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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=day+and+night+worksheet+pdf PDF link annotation
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/nunobavupig.pdfIn PDF document text
    • https://gumebasa.weebly.com/uploads/1/3/4/5/134509515/gibal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f8ebda20a293.pdfIn PDF document text
    • https://zaboxunur.weebly.com/uploads/1/3/4/3/134369304/bb198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383300/normal_5f9dce596b922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_5fa7956e55f26.pdfIn PDF document text
    • https://tujulita.weebly.com/uploads/1/3/4/6/134687611/b02c55ecbf42093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_5f9093641df68.pdfIn PDF document text
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/d7951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_5f8b7cf653a82.pdfIn PDF document text
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/lavilalade_sevuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5f99f775d41c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5f96535c0d21d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_5faa701280477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_5fae44f782562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_5f98f53d07f29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EB 5528 bytes
SHA-256: 460fc9ead94364129c9c8d6edfc88a5f706220a20e2943748d57ed2cb0f1b202
font_01_sfnt_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 10320 bytes
SHA-256: 16e577564a19f83f806d3e7e5c01654b228d8a1ce3a343d75aa03e8026d74c51

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