Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54787398308afe2…

MALICIOUS

PDF

46.8 KB Created: 2020-04-11 04:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a4281e170951d07ee4cd49ca2995a20c SHA-1: 37d4a978616b4d194a115fa6f2f7cdc757259078 SHA-256: a54787398308afe2ed1c669dfb0cb0141dd3f09623d8955d64aa0c3fe7f0791e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is the distribution of numerous external links, suggesting a link farm or a method to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://socalspecialtycoating.com/uploads/1/3/0/4/130477890/130477890.html#diccionario+en+castellano+sinonimos PDF link annotation
    • http://mvnatmed.com/uploads/1/3/1/1/131163505/rezegopufufawetote.pdfIn PDF document text
    • http://hairbydwoo.com/uploads/1/3/0/4/130478975/gotavoloj_foguvil_wejad.pdfIn PDF document text
    • http://kofferkino.de/uploads/1/3/0/3/130323100/7097204.pdfIn PDF document text
    • http://next-level-impression.com/uploads/1/3/0/4/130476844/bakisogul.pdfIn PDF document text
    • http://siberianpurrbabies.com/uploads/1/3/0/7/130776065/likoloda_geripofedeku_zemaw.pdfIn PDF document text
    • http://replenishmysoul.com/uploads/1/3/0/5/130543598/b88f27580d.pdfIn PDF document text
    • http://cpr-trainingclasses.net/uploads/1/3/0/5/130542692/2139820.pdfIn PDF document text
    • http://deannasgro.ca/uploads/1/3/0/7/130740078/3011670.pdfIn PDF document text
    • http://originalhandcraft.com/uploads/1/3/0/5/130539871/5a0b6d37.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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
🗂 Part of campaign: campaignartwork.com 3 samples

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000699a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x699A 10716 bytes
SHA-256: 06948adf5a3e05363a3559413723c09f763153b530171b501d5d58be4730b6cf
font_01_sfnt_off00008e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E36 2652 bytes
SHA-256: e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea
font_02_sfnt_off0000979f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x979F 16104 bytes
SHA-256: d66ec6bda34a5f069bb653e568c1f15db73d6429105816389650c77074cc6d70

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