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)
MD5: db9757bdb87f33a2bec491f0f6abd580 SHA-1: 4cc29629de096e98d3682553e9a98469859a56ef SHA-256: 8247d2b7ad2ab641b3e52725fed0829c6d801302bfba18b2f96da35eedbe1876
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, a technique often used for SEO poisoning to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness. The document body text and extracted URLs suggest a lure related to jail mugshots, directing users to a farm of PDF files hosted on various domains.

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
    • http://elisenapier.com/uploads/1/3/0/5/130545557/a4360f1df.pdf
    • http://humbertooliveira.com/uploads/1/3/0/7/130776823/9028787.pdf
    • http://truehms.com/uploads/1/3/0/6/130603913/8233138.pdf
    • http://ketchikaneaglecove.com/uploads/1/3/0/2/130271234/mizujufu_vozinomabobuf.pdf
    • http://inseasonvt.com/uploads/1/3/0/7/130740163/jotow.pdf
    • http://vpn.laurelmedpa.com/uploads/1/3/0/7/130775443/3c8b97ccded.pdf
    • http://reallyhomepittsburgh.com/uploads/1/3/0/7/130775196/dovori_labogomavuxede.pdf
    • http://folsomlandscapedesign.com/uploads/1/3/0/5/130539992/bawolidej_wobafubo.pdf
    • http://www.everwoodcreek.ca/uploads/1/3/0/3/130313173/2cb5b3b.pdf
    • http://lilypadplanet.com/uploads/1/3/0/6/130605083/gimavivalikigi_jomijebotol.pdf
    • http://willowpropertysolutions.net/uploads/1/3/0/5/130588500/16d713c9368.pdf
    • http://ninagandhi.net/uploads/1/3/0/2/130271259/susudusilotu.pdf
    • http://postmaster.casajuliana.nl/uploads/1/3/0/8/130815351/tonarolofa.pdf
    • http://phoenixadjusters.net/uploads/1/3/0/5/130551387/d284da5b202d69.pdf
    • http://tastebuddice.com/uploads/1/3/0/7/130775778/fd2c1bf69d.pdf
    • http://www.sidneyharbourcruise.com/uploads/1/3/0/7/130739680/xisobunoxomanolenofo.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_off00006f84.bin
3778fab0d1f5208011bf887ae8f3608e7e58b958ad4205dded4db382876f1e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F84 8428 bytes

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