Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5624bb78077b4cc…

MALICIOUS

PDF

38.6 KB Created: 2020-05-18 16:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 595d70463a95b7f762aff3feefe40963 SHA-1: 42666260a527baf6af0e9e445446ca8a4fe820fb SHA-256: a5624bb78077b4cc4f5d4dcc3e4d6e3f8a1a0231c9541060a80c5f402f356b49
96 Risk Score

Malware Insights

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

The PDF document contains a title suggesting a health-related topic ('Como curar las grietas del pezon') to entice users. It embeds a large number of external links, many of which point to similarly structured URLs on various domains, indicating a link farm or SEO spam operation. The primary heuristic firing confirms this, identifying a 'PDF_SEO_LINK_FARM' with numerous external links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://trentriverdesigns.com/uploads/1/3/0/5/130589184/130589184.html#como+curar+las+grietas+del+pezon PDF link annotation
    • http://stocktontljsoccer.com/uploads/1/3/0/6/130639565/6165964.pdfIn PDF document text
    • http://painbrun.com/uploads/1/3/1/3/131380983/8494a90.pdfIn PDF document text
    • http://network4u.net/uploads/1/3/0/6/130605498/xopasa_lokulabadaju_vetuzu.pdfIn PDF document text
    • http://deannaheon.com/uploads/1/3/1/3/131384256/1413421.pdfIn PDF document text
    • http://ezconsumerscreditsolution.net/uploads/1/3/0/4/130477293/116eec5aa02c566.pdfIn PDF document text
    • http://shoeco.us/uploads/1/3/1/6/131606511/bavaruxidel-werab-dorotokides-fizejosel.pdfIn PDF document text
    • http://resolvescientific.com/uploads/1/3/1/6/131606228/9412413.pdfIn PDF document text
    • http://srkeuropartsltda.com/uploads/1/3/0/6/130620581/busipeguvezi.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

Related samples 1

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6996 11184 bytes
SHA-256: c09473c0add00323aae22acc1402ab8b6c409e88c0f8561a86166d4aa8d3f04e

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