Malicious PDF — malware analysis report

Static analysis result for SHA-256 8247d2b7ad2ab641…

MALICIOUS

PDF

39.2 KB Created: 2020-03-25 13:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: db9757bdb87f33a2bec491f0f6abd580 SHA-1: 4cc29629de096e98d3682553e9a98469859a56ef SHA-256: 8247d2b7ad2ab641b3e52725fed0829c6d801302bfba18b2f96da35eedbe1876
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm, suggesting a malicious SEO or content distribution scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs indicates an attempt to redirect the user to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://shiying-cheng.com/uploads/1/3/1/3/131382693/131382693.html#lamar+county+alabama+jail+mugshots PDF link annotation
    • http://elisenapier.com/uploads/1/3/0/5/130545557/a4360f1df.pdfIn PDF document text
    • http://humbertooliveira.com/uploads/1/3/0/7/130776823/9028787.pdfIn PDF document text
    • http://truehms.com/uploads/1/3/0/6/130603913/8233138.pdfIn PDF document text
    • http://ketchikaneaglecove.com/uploads/1/3/0/2/130271234/mizujufu_vozinomabobuf.pdfIn PDF document text
    • http://inseasonvt.com/uploads/1/3/0/7/130740163/jotow.pdfIn PDF document text
    • http://vpn.laurelmedpa.com/uploads/1/3/0/7/130775443/3c8b97ccded.pdfIn PDF document text
    • http://reallyhomepittsburgh.com/uploads/1/3/0/7/130775196/dovori_labogomavuxede.pdfIn PDF document text
    • http://folsomlandscapedesign.com/uploads/1/3/0/5/130539992/bawolidej_wobafubo.pdfIn PDF document text
    • http://www.everwoodcreek.ca/uploads/1/3/0/3/130313173/2cb5b3b.pdfIn PDF document text
    • http://lilypadplanet.com/uploads/1/3/0/6/130605083/gimavivalikigi_jomijebotol.pdfIn PDF document text
    • http://willowpropertysolutions.net/uploads/1/3/0/5/130588500/16d713c9368.pdfIn PDF document text
    • http://ninagandhi.net/uploads/1/3/0/2/130271259/susudusilotu.pdfIn PDF document text
    • http://postmaster.casajuliana.nl/uploads/1/3/0/8/130815351/tonarolofa.pdfIn PDF document text
    • http://phoenixadjusters.net/uploads/1/3/0/5/130551387/d284da5b202d69.pdfIn PDF document text
    • http://tastebuddice.com/uploads/1/3/0/7/130775778/fd2c1bf69d.pdfIn PDF document text
    • http://www.sidneyharbourcruise.com/uploads/1/3/0/7/130739680/xisobunoxomanolenofo.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F84 8428 bytes
SHA-256: 3778fab0d1f5208011bf887ae8f3608e7e58b958ad4205dded4db382876f1e1a