Malicious PDF — malware analysis report

Static analysis result for SHA-256 381c0d3d67e95d55…

MALICIOUS

PDF

32.8 KB Created: 2020-04-13 15:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0c7edf05c9f166f2e96d292f2c2b22eb SHA-1: d85253e4b06d6f4914847e17927f93afd448dc23 SHA-256: 381c0d3d67e95d555c23cf322f30b3ab0652fce750529237ca3d58e45baacd53
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body text is largely unreadable due to encoding issues, but the presence of numerous links suggests a malicious intent, possibly for SEO spam or to direct users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://montanapurewood.com/uploads/1/3/0/9/130969777/130969777.html#escritura+de+numeros+decimales+hasta+milesimos
    • http://petspadogtrainer911.com/uploads/1/3/1/3/131379594/5905602.pdf
    • http://kcpurenaturals.com/uploads/1/3/0/5/130538945/7689448.pdf
    • http://rebeccapottfitton.com/uploads/1/3/0/5/130590578/gevonoxesidetew.pdf
    • http://theradicallygood.com/uploads/1/3/1/3/131382531/4500432.pdf
    • http://cardinalyards.com/uploads/1/3/0/9/130969632/wuvusaborewax.pdf
    • http://biggerstick.info/uploads/1/3/1/4/131482958/86e5876d266.pdf
    • http://clemsoncorners.com/uploads/1/3/0/2/130272575/8279480.pdf
    • http://carterstrategicmarketing.com/uploads/1/3/1/4/131437354/movusarekikosas_fisemov_resaxuset_temagevul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000598d.bin
aaaa1b9283d3adafbecc882f28eed88548fbc09bf91c575abc863b430eeac289		 pdf-font-stream PDF embedded font (sfnt) at offset 0x598D 7496 bytes

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