Malicious PDF — malware analysis report

Static analysis result for SHA-256 438f82eb1033d026…

MALICIOUS

PDF

38.2 KB Created: 2020-04-15 06:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 29312b3c2acfd9d6e9a03e7f66534b79 SHA-1: 74978b0cfc8494c81912720b535b8c5ab3ce439d SHA-256: 438f82eb1033d026771277ab9ecf42aa657aa86b340b6455bb8524da35b40d80
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by an ML classifier as malicious. It contains a large number of external links, many of which point to domains that appear to be part of a link farm. The primary purpose seems to be SEO manipulation or redirecting users to potentially harmful content, rather than delivering a direct exploit. No scripts were extracted, limiting the ability to determine specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://lao-lu-fang.com/uploads/1/3/0/9/130969308/130969308.html#right+triangle+trigonometry+worksheet+doc
    • http://prestigeeminence.com/uploads/1/3/0/5/130550882/walonaxewabeget_medodajopo.pdf
    • http://travelandtrendswithz.com/uploads/1/3/0/4/130476294/jimopomigusememaxex.pdf
    • http://joshuahouchin.com/uploads/1/3/1/4/131414240/5186536.pdf
    • http://tracevilab.com/uploads/1/3/0/5/130541733/641ec152.pdf
    • http://marriottediting.com/uploads/1/3/0/6/130620796/refevilir-difiz-lemavi-vefetax.pdf
    • http://detrose.com/uploads/1/3/0/7/130776460/zulimewuveziganefe.pdf
    • http://materielledesigns.com/uploads/1/3/0/6/130604225/5810948.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_off0000644b.bin
e9845aeed225f861f0fbae5f170103111c26421b626fe8ab7fe92feedeb20941		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644B 7788 bytes
font_01_sfnt_off0000828d.bin
11eff0542ee112a7a4f3d5fa86892f13f7f7c80edb17354215cea33bb7714487		 pdf-font-stream PDF embedded font (sfnt) at offset 0x828D 2768 bytes

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