Malicious PDF — malware analysis report

Static analysis result for SHA-256 187e7a66df5e4a09…

MALICIOUS

PDF

39.8 KB Created: 2020-03-17 09:17:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f93594bd8a7a6a05f8cf9fbfbcf00cf2 SHA-1: ef696e3c4c1a8eb337535a4a1d9b136f64892d4d SHA-256: 187e7a66df5e4a09a16e43aa37f04e2eb544efda71c8a4ae0110c6a7df001b6b
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, contains text related to 'usi 5204 smoke detector replacement' and numerous URLs pointing to other PDF files, indicating a coordinated effort to drive traffic to these sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

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://kimresine.ca/uploads/1/3/0/6/130620305/130620305.html#usi+5204+smoke+detector+replacement
    • http://unitedecap.com/uploads/1/3/0/2/130272481/judixonedebuzet_zirededewesatel_rafiwiraz_rajazugi.pdf
    • http://reapvalue.net/uploads/1/3/0/5/130542729/1297867.pdf
    • http://arcfreeborncounty.org/uploads/1/3/0/6/130604255/kexifupagemosev-foxifuvedetow.pdf
    • http://www.chickything.com/uploads/1/3/0/6/130639042/7d22e.pdf
    • http://www.glassdogstudio.com/uploads/1/3/0/7/130776503/pumefudatedadi-rutuve-xivugulon-gowuvojosoko.pdf
    • http://henshaw-lab.com/uploads/1/3/0/7/130775176/641a7d13.pdf
    • http://vendome-international.com/uploads/1/3/0/6/130620494/9fed53dac04.pdf
    • http://739903481180250801.com/uploads/1/3/0/2/130274199/99900.pdf
    • http://graceunderpressure.org/uploads/1/3/0/5/130544625/vufobukam.pdf
    • http://mail.seethejoy.net/uploads/1/3/0/2/130270864/1022530.pdf
    • http://martimmo.com/uploads/1/3/0/6/130640109/4373c.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_off000073bf.bin
8a0d1071e51d9b2ea4e76c2c1a8d4e7e065eb323074e3f553df86817e10ac449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73BF 7920 bytes

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