Malicious PDF — malware analysis report

Static analysis result for SHA-256 994dfa6083718c51…

MALICIOUS

PDF

43.0 KB Created: 2020-03-22 04:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d273ee6363857814b897af5973991903 SHA-1: aa37744a2549c796dacfe3b609c76f1da72075ae SHA-256: 994dfa6083718c51f4169916159f7514f46781321c3348cc93b0d1f3f57eb6d6
94 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful content or for SEO manipulation. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded URLs supports this assessment. No scripts were extracted, but the sheer volume of links points to a delivery mechanism for further compromise.

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://wesleyanmomsclub.org/uploads/1/3/0/6/130604557/130604557.html#crop-a-dile+iitm+big+bite+punch
    • http://equimg.com/uploads/1/3/0/8/130873869/zupukeru.pdf
    • http://www.chopshopsaladshop.com/uploads/1/3/0/7/130740077/zoxerewejode.pdf
    • http://stpfloraldesign.org/uploads/1/3/0/4/130476150/9888646.pdf
    • http://dehost-server.lv01.hendersonchamber.com/uploads/1/3/0/6/130620614/9832030.pdf
    • http://missiontriangle.us/uploads/1/3/1/0/131071021/7d39cb3fc.pdf
    • http://redmaplemarketingagency.com/uploads/1/3/0/2/130271184/zaresodexuvewe-rabujum-xisegikugipe.pdf
    • http://reifierentertainmentdevelopment.com/uploads/1/3/0/5/130588678/jutubowajib_fobilulaxoniso.pdf
    • http://huraworld.com/uploads/1/3/0/3/130379331/8962037.pdf
    • http://vaycaypros.com/uploads/1/3/0/5/130588389/zapux-jiruzoke.pdf
    • http://josephbeggsfoundation.org/uploads/1/3/0/7/130739510/tesufi.pdf
    • http://www.hdpetrochemicalsolution.com/uploads/1/3/0/9/130969991/908496.pdf
    • http://www.myamazingwatches.com/uploads/1/3/0/6/130621096/3698211.pdf
    • http://peddlerscache.com/uploads/1/3/0/5/130588433/7536237.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007465.bin
f2c3941b8b9105d69a2379c8bf57d65585e7a9406d990e73ba212ed434f1db60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7465 8688 bytes
font_01_sfnt_off00009589.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9589 2616 bytes

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